東京メトロは2月4日、同全線が1日乗り放題になる「東京メトロ一日乗車券」を、使用開始から24時間有効になる「東京メトロ24時間券」に変更すると発表した。発売価格は現行の600円のまま変更しない。
これまでの1日乗車券では、午後1時に使いはじめると、その日の終電までしか使えなかった。24時間券では、翌日の午後1時まで有効になる。
24時間券は3月26日から利用可能。なお、現在発売している1日乗車券の前売り券についても、未使用なものに限り、3月26日から9月30日までの間、24時間券（前売り）に交換してもらえる。
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世界の美しい地下鉄
Solna centrum, Solna Municipality, Sweden(01 of52)
Solna centrum station features red-painted walls of exposed bedrock. Murals painted on them depict “rural depopulation, the destruction of the environment, forests and nature,\" according to Sweden\'s The Local. (credit:Flickr:imagea.org)
ITALY-SUBWAY-ART-NAPLES(02 of52)
People stand in the \'Cathedral\' with the Crater of Luz by Spanish artist Oscar Tusquet Blanca in the Toledo subway station as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
ITALY-NAPLES-SUBWAY(03 of52)
PHOTO PACKAGE 20/22 - EUROPEAN OUTSTANDING METRO STATIONS People walk in the \'Cathedral\' with the Crater of Luz by artist Oscar Tusquet Blanca in the Toledo subway station as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
ITALY-NAPLES-SUBWAY(04 of52)
PHOTO PACKAGE 21/22 - EUROPEAN OUTSTANDING METRO STATIONS People walk in the \'Cathedral\' with the Crater of Luz by artist Oscar Tusquet Blanca in the Toledo subway station as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
SWEDEN-STOCKHOLM-SUBWAY-ART(05 of52)
PHOTO PACKAGE 15/22 - EUROPEAN OUTSTANDING METRO STATIONS People walk at the Stadion subway station on November 6, 2012 in Stockholm. Over 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images) (credit:Getty Images)
RUSSIA-MOSCOW-SUBWAY(06 of52)
A subway passenger walks on the platform of the Dostoyevskaya metro station in Moscow, on November 15, 2012. The station was named after Fyodor Dostoyevsky, one of the highly regarded Russian writers. AFP PHOTO / KIRILL KUDRYAVTSEV (Photo credit should read KIRILL KUDRYAVTSEV/AFP/Getty Images) (credit:Getty Images)
POLAND-SUBWAY-WARSAW(07 of52)
A comuter waits for a train at Warsaw subway station \'Plac Wilsona\' on November 14, 2012. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images) (credit:Getty Images)
GERMANY-MUNICH-SUBWAY(08 of52)
PHOTO PACKAGE 6/22 - EUROPEAN OUTSTANDING METRO STATIONS A train leaves the subway station Westfriedhof in Munich, southern Germany, on November 14, 2012. The subway station was opened on May 23, 1998. 11 large lamps measuring 3.80 metres in diameter were installed in 2001 and bathe the station in blue, red and yellow light. AFP PHOTO/CHRISTOF STACHE (Photo credit should read CHRISTOF STACHE/AFP/Getty Images) (credit:Getty Images)
GERMANY-MUNICH-SUBWAY(09 of52)
PHOTO PACKAGE 7/22 - EUROPEAN OUTSTANDING METRO STATIONS A train arrives the subway station Westfriedhof in Munich, southern Germany, on November 14, 2012. The subway station was opened on May 23, 1998. 11 large lamps measuring 3.80 metres in diameter were installed in 2001 and bathe the station in blue, red and yellow light. AFP PHOTO/CHRISTOF STACHE (Photo credit should read CHRISTOF STACHE/AFP/Getty Images) (credit:Getty Images)
GERMANY-SUBWAY-MUNICH(10 of52)
Passangers walk at the subway station Muenchner Freiheit in Munich, southern Germany, on November 14, 2012. The subway station was rebuilded on 2008/2009. AFP PHOTO/CHRISTOF STACHE (Photo credit should read CHRISTOF STACHE/AFP/Getty Images) (credit:Getty Images)
Kungstradgarden, Stockholm, Sweden(11 of52)
More than 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (credit:Getty Images)
SWEDEN-STOCKHOLM-SUBWAY-ART(12 of52)
People walk at the Kungstradgarden subway station on November 6, 2012 in Stockholm. Over 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images) (credit:Getty Images)
SWEDEN-STOCKHOLM-SUBWAY-ART(13 of52)
View of the Kungstradgarden subway station on November 6, 2012 in Stockholm. Over 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images) (credit:Getty Images)
SWEDEN-STOCKHOLM-SUBWAY-ART(14 of52)
People wait for their trains at the Tekniska Hogskolan subway station on November 6, 2012 in Stockholm. Over 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images) (credit:Getty Images)
RUSSIA-MOSCOW-SUBWAY(15 of52)
PHOTO PACKAGE 22/22 - EUROPEAN OUTSTANDING METRO STATIONS A general view of Komsomolskaya metro station of the Koltsevaya Line in Moscow subway, on November 2, 2012. The station was opened in 1952. AFP PHOTO / KIRILL KUDRYAVTSEV (Photo credit should read KIRILL KUDRYAVTSEV/AFP/Getty Images) (credit:Getty Images)
POLAND-SUBWAY(16 of52)
Entrance to \'Plac Wilsona\' subway station in Warsaw on November 2, 2012. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images) (credit:Getty Images)
POLAND-WARSAW-SUBWAY(17 of52)
PHOTO PACKAGE 13/22 - EUROPEAN OUTSTANDING METRO STATIONS Entrance to \'Plac Wilsona\' subway station in Warsaw on November 2, 2012. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images) (credit:Getty Images)
ITALY-SUBWAY-ART-NAPLES(18 of52)
People walk in the University subway station with artworks of Egyptian artist Karim Rashid as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
SWEDEN-STOCKHOLM-SUBWAY-ART(19 of52)
People walk at the T-Centralen subway station on November 6, 2012 in Stockholm. Over 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images) (credit:Getty Images)
BRAZIL-WC2014-GRAFITTI(20 of52)
A man walks by a graffiti on the wall of Maracana subway station, in Rio de Janeiro, on November 6, 2012. Metro Rio asked grafitti artists to paint Rio\'s tube line 2. AFP PHOTO / Christophe Simon (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images) (credit:Getty Images)
NKOREA-POLITICS-TRANSPORT(21 of52)
Commuters walk inside Puhung subway station in Pyongyang on April 14, 2012. Pyongyang\'s metro network was opened between 1969 and 1972 by former President Kim Il-Sung, and is supposedly the deepest in the world with its track some 110 metres underground. North Korea marks the centenary of the birth of founding leader Kim Il-Sung on April 15. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/GettyImages) (credit:Getty Images)
ITALY-SUBWAY-ART-NAPLES(22 of52)
people walk in the Toledo subway station with artworks by US artist Robert Wilson as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA,MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
ITALY-SUBWAY-ART-NAPLES(23 of52)
People walk in the Dante subway station with artworks as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
ITALY-SUBWAY-ART-NAPLES(24 of52)
People walk in the Dante subway station with artworks as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
GERMANY-SUBWAY-FEATURE-FRANKFURT(25 of52)
The entrance to a subway station \'Bockenheimer Warte\', looking like a train bursting through the sidewalk, designed by German architect Zbigniew Peter Pininski, is seen in Frankfurt am Main, on November 7, 2012. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images) (credit:Getty Images)
GERMANY-SUBWAY-FEATURE-FRANKFURT(26 of52)
The entrance to a subway station \'Bockenheimer Warte\', looking like a train bursting through the sidewalk, designed by German architect Zbigniew Peter Pininski, is seen in Frankfurt am Main, on November 7, 2012. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images) (credit:Getty Images)
GERMANY-SUBWAY-FEATURE-FRANKFURT(27 of52)
The entrance to a subway station \'Bockenheimer Warte\', looking like a train bursting through the sidewalk, designed by German architect Zbigniew Peter Pininski, is seen in Frankfurt am Main, on November 7, 2012. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images) (credit:Getty Images)
SWEDEN-STOCKHOLM-SUBWAY-ART(28 of52)
PHOTO PACKAGE 16/22 - EUROPEAN OUTSTANDING METRO STATIONS People wait for their train to stop at the Solna subway station on November 6, 2012 in Stockholm. Over 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images) (credit:Getty Images)
RUSSIA-SAINT-PETERSBURG-SUBWAY(29 of52)
Subway passengers walk at the Avtovo metro station in Saint-Petersburg, on November 14, 2012. AFP PHOTO / OLGA MALTSEVA (Photo credit should read OLGA MALTSEVA/AFP/Getty Images) (credit:Getty Images)
RUSSIA-SAINT PETERSBURG-SUBWAY(30 of52)
Subway passengers walk at the Avtovo metro station in Saint-Petersburg, on November 14, 2012. AFP PHOTO / OLGA MALTSEVA (Photo credit should read OLGA MALTSEVA/AFP/Getty Images) (credit:Getty Images)
RUSSIA-MOSCOW-SUBWAY(31 of52)
PHOTO PACKAGE 10/22 - EUROPEAN OUTSTANDING METRO STATIONS Subway passengers walk at the Mayakovskaya metro station in Moscow, on November 14, 2012. AFP PHOTO / KIRILL KUDRYAVTSEV (Photo credit should read KIRILL KUDRYAVTSEV/AFP/Getty Images) (credit:Getty Images)
RUSSIA-MOSCOW-SUBWAY(32 of52)
Subway passengers sit under a station nameplate at the Slavyansky Bulvar metro station in Moscow, on November 14, 2012. AFP PHOTO / KIRILL KUDRYAVTSEV (Photo credit should read KIRILL KUDRYAVTSEV/AFP/Getty Images) (credit:Getty Images)
Ploshchad Revolyutsii, Moscow, Russia(33 of52)
Ploshchad Revolyutsii means Revolution Square, and the station, opened in 1938, features bronze sulptures of the people of the Soviet Union, like soldiers, farmers, athletes and writers. (credit:Alamy)
RUSSIA-METRO(34 of52)
A picture taken on November 14, 2012, shows subway passengers walk at the Narvskaya metro station in Saint-Petersburg. AFP PHOTO / OLGA MALTSEVA (Photo credit should read OLGA MALTSEVA/AFP/Getty Images) (credit:Getty Images)
ITALY-SUBWAY-ART-NAPLES(35 of52)
This picture shows a view of the Materdei subway station with artworks by Italian artist Alessandro Mendini as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images) (credit:Getty Images)
ITALY-SUBWAY-ART-NAPLES(36 of52)
People pass in the Dante subway station with artworks by US artist Joseph Kosut as part of the \'Art Station Line 1\' project on November 5, 2012 in Naples. AFP PHOTO / MARIO LAPORTA (Photo credit should read /AFP/Getty Images) (credit:Getty Images)
UKRAINE-TRANSPORT-SUBWAY(37 of52)
Picture taken on November 13, 2012 in Kiev of a corridor of the \'Gold Gate\' subway station. AFP PHOTO/ SERGEI SUPINSKY (Photo credit should read SERGEI SUPINSKY/AFP/Getty Images) (credit:Getty Images)
UKRAINE-TRANSPORT-SUBWAY(38 of52)
Picture taken on November 13, 2012 in Kiev of a corridor of the \'Gold Gate\' subway station. AFP PHOTO/ SERGEI SUPINSKY (Photo credit should read SERGEI SUPINSKY/AFP/Getty Images) (credit:Getty Images)
UKRAINE-TRANSPORT-SUBWAY(39 of52)
Picture taken on November 13, 2012 in Kiev of a corridor of the \'Gold Gate\' subway station. AFP PHOTO/ SERGEI SUPINSKY (Photo credit should read SERGEI SUPINSKY/AFP/Getty Images) (credit:Getty Images)
PORTUGAL-LISBON-SUBWAY-TRANSPORT-THEME(40 of52)
PHOTO PACKAGE 4/22 - EUROPEAN OUTSTANDING METRO STATIONS A subway passenger stands on an escalator at the Olaias metro station in Lisbon on November 26, 2012. AFP PHOTO/ MIGUEL RIOPA (Photo credit should read MIGUEL RIOPA/AFP/Getty Images) (credit:Getty Images)
PORTUGAL-THEME-PUBLIC-SUBWAY-TRANSPORT(41 of52)
A picture taken on November 26, 2012 shows a subway train at the Olaias metro station in Lisbon. AFP PHOTO/ MIGUEL RIOPA (Photo credit should read MIGUEL RIOPA/AFP/Getty Images) (credit:Getty Images)
FRANCE-TRANSPORTS-SUBWAY(42 of52)
A picture taken on November 27, 2012 of a commuter walking on a platform at the Station Cluny-La Sorbonne metro station in Paris. AFP PHOTO / PATRICK KOVARIK (Photo credit should read PATRICK KOVARIK/AFP/Getty Images) (credit:Getty Images)
BRAZIL-WC2014-GRAFITTI(43 of52)
A man walks by a graffiti allusive to the FIFA 2014 World Cup, on the wall of Maracana subway station, in Rio de Janeiro, on November 6, 2012. Metro Rio asked grafitti artists to paint Rio\'s tube line 2. AFP PHOTO / Christophe Simon (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images) (credit:Getty Images)
SWEDEN-STOCKHOLM-SUBWAY-ART(44 of52)
A woman waits for her train at the Universitetet subway station on November 6, 2012 in Stockholm. Over 90 of the 100 subway stations in Stockholm have been decorated with sculptures, mosaics, paintings, installations, engravings and reliefs by over 150 artists. AFP PHOTO / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images) (credit:Getty Images)
Abbesses, Paris, France(45 of52)
The Abbesses station, which serves Montmartre, was opened in 1912. It is one of two original glass-covered Hector Guimard-designed Art Nouveau station entrances left in the city. (credit:WikiMedia:)
Louvre-Rivoli, Paris, France(46 of52)
One of the metro stops for the famous Louvre museum, this metro station is adorned by replicas of the museum\'s ancient art. (credit:Alamy)
Acropolis Station, Athens, Greece(47 of52)
One of the stations serving the Greek icon, Acropolis station is decorated by ancient-style friezes. (credit:Flickr:(Mick Baker)rooster)
Zocalo, Mexico City, Mexico(48 of52)
Inside this metro stop in the heart of Mexico City are display cases containing models that depict different periods in the site\'s history. (credit:Flickr:Cåsbr)
Piccadilly Circus, London, England(49 of52)
Opened in 1906, the Piccadilly Circus stop is on the Piccadilly Line between Green Park and Leicester Square and on the Bakerloo line between Charing Cross and Oxford Circus. (credit:WikiMedia:)
Dhoby Ghaut, Singapore(50 of52)
Dhoby Ghaut lies along the southern end of Orchard Road. (credit:Alamy)
Yodoyabashi Station, Osaka, Japan(51 of52)
Yodoyabashi Station is on the Osaka Municipal Subway Midosuji Line and the Keihan Railway Keihan Main Line. (credit:WikiMedia:)
CZECH-TRANSPORT-SUBWAY-PRAGUE(52 of52)
A train leaves the Staromestska station on the B line subway in Prague, Czech Republic on November 09, 2012. AFP PHOTO / MICHAL CIZEK (Photo credit should read MICHAL CIZEK/AFP/Getty Images) (credit:Getty Images)
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