1955 in Japan

Incumbents

• Emperor: Hirohito
• Prime Minister: Ichirō Hatoyama
• Chief Cabinet Secretary: Ryutaro Nemoto
• Chief Justice of the Supreme Court: Kōtarō Tanaka
• President of the House of Representatives: Tō Matsunaga until January 24, Shūji Masutani from March 18
• President of the House of Councillors: Yahachi Kawai

  Events

• January 28 - Benesse Corporation was founded, as predecessor name was Fukutake Shoten.
• February 17 - According to Japan Fire and Disaster Management Agency official confirmed report, Seibo no Sono fire in Totsuka-ku, Yokohama, total 99 person were death.
• February 26 - A first issue of Sankei Sports published in Osaka.
• February 27 - 1955 Japanese general election
• April Unknown date - Bunka Shutter was founded, as predecessor name was Nippon Bunka Steel Door.
• April 7 - Radio Tokyo TV begins broadcasting.
• April 16–17 - Abe coal mine debris collapse, due to heavy torrential rain hit in Sasebo, Nagasaki Prefecture, resulting tn 73 persons death, according to JFDMA official confirmed report.
• April 21 - Opening of Gokō Station
• May 11 - Shiun Maru disaster
• May 14 - According to Japan National Police Agency official confirmed report, a charter bus plunged into the Kitakami River in Iwate Prefecture, resulting in twelve deaths and twenty-eight injured.
• July 28- According to JFDMA official confirmed report, 36 junior school students died when a high wave hit, during school swimming lesson in Nakakawara beach, Tsu, Mie Prefecture.
• September 3 - Yumiko-chan incident
• November 1 - According to JFDMA official confirmed report, Moshiri Coal mine gas explosion hit in Akabira, Hokkaido, official death toll number is 60, with 17 person were wounded.
• November 15 - Japan Liberal Party and Democratic Party of Japan were unified, ruling Liberal Democratic Party of Japan has started.
• Establishment of Akkeshi Prefectural Natural Park

  Births

• January 13 - Ran Ito, actress
• January 15 - Mayumi Tanaka, voice actress
• January 17 - Mami Koyama, voice actress
• January 20 - Hiromi Ōta, singer
• January 22 - Keiko Takahashi, actress
• January 28 - George Tokoro, television personality and singer-songwriter
• February 12 - Ai Satō, voice actress
• February 13 - Akiko Yano, singer-songwriter
• March 2 - Shoko Asahara, cult leader
• March 16 - Jiro Watanabe, boxer
• March 20 - Mariya Takeuchi, singer-songwriter
• April 5 - Akira Toriyama, Manga artist
• April 7 - Akira Nishino, soccer player and manager
• April 13 - Hideki Saijo, singer and actor
• April 15 - Ryūtarō Nakamura, Anime director
• April 23 - Fumi Hirano, voice actress and essayist
• April 29 - Yūko Tanaka, actress
• May 24 - Rumiko Ukai, voice actress
• May 25 - Suguru Egawa, baseball player
• May 26 - Masaharu Morimoto, chef
• May 30 - Nakamura Kanzaburō XVIII, Kabuki actor
• June 1 - Chiyonofuji Mitsugu, sumo wrestler
• June 26 - Yoko Gushiken, boxer
• July 1 - Sanma Akashiya, comedian and actor
• August 20 - Agnes Chan, television personality
• August 30 - Mayumi Muroyama, Manga artist
• September 4 - Hiroshi Izawa, actor
• September 24 - Shinbo Nomura, Manga artist
• October 18 - Hiromi Go, singer
• October 19 - LaSalle Ishii, television personality
• October 21 - Yasukazu Hamada, politician
• October 29 - Etsuko Shihomi, actress
• November 3 - Yukihiko Tsutsumi, film director
• November 14 - Koichi Nakano, bicycle rider
• December 9 - Asashio Tarō IV, sumo wrestler
• December 16 - Chiharu Matsuyama, singer-songwriter
• December 24 - Mizuho Fukushima, politician

  Deaths

• February 17 - Ango Sakaguchi, author
• October 15 - Fumio Hayasaka, composer
• October 25 - Sadako Sasaki, hibakusha