Amit Dave / Reuters
第48回衆議院選挙は10月22日、午前7時から全国4万7000カ所余りの投票所で始まり、午後8時で締め切られた。直ちに開票が始まり、朝日新聞デジタルなどは、朝日新聞社がANNとの共同で実施した出口調査の推計結果として、自民党（公示前勢力284）の獲得議席は260議席を上回り、単独過半数を確保する見通しと報じた。
また、希望の党（同57）と立憲民主党（同15）はそれぞれ50議席台半ばになるとみられ、野党第1党を激しく争っているという。
衆院選は2014年12月以来で、自公の政権復帰後2回目。選挙戦は、与党に「希望の党・日本維新の会」「共産党・立憲民主党・社民党」が挑む3極対決の構図。北朝鮮情勢や憲法改正、消費税増税、森友・加計学園問題をめぐる首相の政治姿勢などが主な争点となった。
安倍晋三首相（自民党総裁）は、与党による過半数（233議席）維持を勝敗ラインに掲げており、自民・公明両党の獲得議席が焦点となった。また、どの政党が野党第一党になるのかも注目されている。
小選挙区289、比例代表176の計465議席に対し、選挙区936人、比例（重複立候補者除く）244人の計1180人が立候補した。また、安倍首相が意欲を示す憲法改正の発議に必要なのは、定数（465）の3分の2にあたる310議席。
なお、総務省によると、午後6時時点の投票率は全国平均で29.99％。前回2014年12月の衆院選の同時点の同時点より4.99ポイント下回っている。
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2017年総選挙
JAPAN-ELECTION/(01 of14)
Japan's Prime Minister Shinzo Abe, who is also leader of the Liberal Democratic Party, attends an election campaign rally in Tokyo, Japan October 18, 2017. REUTERS/Toru Hanai (credit:Toru Hanai / Reuters)
JAPAN-ELECTION/CAMPAIGNING(02 of14)
Japan's Constitutional Democratic Party leader Yukio Edano speaks during an election campaign rally in Tokyo, Japan, October 10, 2017. REUTERS/Issei Kato (credit:Issei Kato / Reuters)
JAPAN-ELECTION/CAMPAIGNING(03 of14)
Head of Japan's Party of Hope and Tokyo Governor Yuriko Koike speaks during an election campaign rally in Tokyo, Japan, October 10, 2017. REUTERS/Issei Kato (credit:Issei Kato / Reuters)
JAPAN-ELECTION/(04 of14)
A woman walks past candidates' posters for the October 22 lower house election in Tokyo, Japan, October 10, 2017. REUTERS/Kim Kyung-Hoon (credit:Kim Kyung Hoon / Reuters)
Japan's Party Leaders Debate Ahead of General Election(05 of14)
Kazuo Shii, chairman of the Japanese Communist Party, speaks during a debate with other party leaders ahead of the general election at the Japan National Press Club in Tokyo, Japan, on Sunday, Oct. 8, 2017. It's premature to talk about an exit from monetary easing, said Japanese Prime Minister�Shinzo Abe during the debate, adding that he is leaving the issue to the Bank of Japan. Photographer: Akio Kon/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
JAPAN-ELECTION/(06 of14)
Supporters of Japan's Prime Minister Shinzo Abe, who is also ruling Liberal Democratic Party leader, wait for him at an election campaign rally in Tokyo, Japan October 18, 2017. REUTERS/Toru Hanai (credit:Toru Hanai / Reuters)
Japan's Party Leaders Debate Ahead of General Election(07 of14)
Natsuo Yamaguchi, chief representative of the New Komeito Party, speaks during a debate with other party leaders ahead of the general election at the Japan National Press Club in Tokyo, Japan, on Sunday, Oct. 8, 2017. It's premature to talk about an exit from monetary easing, said Japanese Prime Minister�Shinzo Abe during the debate, adding that he is leaving the issue to the Bank of Japan. Photographer: Akio Kon/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
Japan's Party Leaders Debate Ahead of General Election(08 of14)
Ichiro Matsui, governor of Osaka and secretary-general of Japan Restoration Association, speaks during a debate with other party leaders ahead of the general election at the Japan National Press Club in Tokyo, Japan, on Sunday, Oct. 8, 2017. It's premature to talk about an exit from monetary easing, said Japanese Prime Minister�Shinzo Abe during the debate, adding that he is leaving the issue to the Bank of Japan. Photographer: Akio Kon/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
JAPAN-VOTE(09 of14)
A man attending an opposition party's election campaign rally holds up a board written 'NO, Abe administration' in Matsudo, Chiba prefecture October 11, 2017.Campaigning began October 10 for the October 22 lower house election. / AFP PHOTO / Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
Japan's Party Leaders Debate Ahead of General Election(10 of14)
Tadatomo Yoshida, president of the Social Democratic Party, speaks during a debate with other party leaders ahead of the general election at the Japan National Press Club in Tokyo, Japan, on Sunday, Oct. 8, 2017. It's premature to talk about an exit from monetary easing, said Japanese Prime Minister�Shinzo Abe during the debate, adding that he is leaving the issue to the Bank of Japan. Photographer: Akio Kon/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
Japan's Party Leaders Debate Ahead of General Election(11 of14)
Masashi Nakano, secretary-general of the Party for Japanese Kokoro, speaks during a debate with other party leaders ahead of the general election at the Japan National Press Club in Tokyo, Japan, on Sunday, Oct. 8, 2017. It's premature to talk about an exit from monetary easing, said Japanese Prime Minister�Shinzo Abe during the debate, adding that he is leaving the issue to the Bank of Japan. Photographer: Akio Kon/Bloomberg via Getty Images (credit:Bloomberg via Getty Images)
JAPAN-POLITICS(12 of14)
Tokyo Governor Yuriko Koike (2nd L) raises a hand during an election campaign appearance at an entrance of a train station in Tokyo on October 10, 2017. Tokyo's popular governor Yuriko Koike launched a bitter attack on Prime Minister Shinzo Abe on October 10 as the gloves came off for the official start of a snap election campaign in the world's third-largest economy. / AFP PHOTO / Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-ELECTION/AGEING(13 of14)
A local resident looks at candidates' posters for the October 22 lower house election in Nanmoku Village, northwest of Tokyo, Japan October 12, 2017. Picture taken October 12, 2017. REUTERS/Issei Kato (credit:Issei Kato / Reuters)
JAPAN-ELECTION/CAMPAIGNING(14 of14)
Japan's Prime Minister Shinzo Abe, who is also ruling Liberal Democratic Party leader, attends an election campaign rally in Fukushima, Japan, October 10, 2017. REUTERS/Toru Hanai (credit:Toru Hanai / Reuters)