January 1 – About 240,000 people in some 93,000 households in Hachinohe and six other municipalities in Aomori Prefecture have gone without water for one to six days because of a duct problem.[2]
January 13 – Aid group worker Dr. Keiko Akahane returns to Japan following her release from three months in captivity in Somalia.[4]
January 14 – Keiji Fujimaki, vice president of Nishimatsu Construction, and three others are arrested on suspicion of violating foreign exchange regulations for allegedly bringing in 70 million Yen in funds from abroad without reporting them to customs authorities.[5]
February 10 – Norihisa Oga, president of Oita-based consultant firm Daiko, is arrested along with six others on suspicion of violating the corporation tax law by masterminding an elaborate tax dodge including slush fundsfunneled by Kajima Construction over the construction of two plants for Canon.[9]
February 13 – Japan Post and leasing firm ORIX agree to cancel their controversial 10.9 billion yen deal involving sell-out of dozens of Kampo no Yado inns and housing facilities.[10]
February 17 – Japanese Finance Minister Shōichi Nakagawa resigns over allegations of drunkenness at the press conference held after the G7 meeting in Rome.[11]
March 3 – The chief secretary of Ichirō Ozawa, head of the DPJ is arrested on suspicion of accepting illegal corporate donations from Nishimatsu Construction.[12]
March 4 – 2-trillion-yen stimulus plan, which allows one-time cash handout of 12,000 yen per person, and additional 8,000 yen for age 18 and under and 65 and older, is approved by a two-thirds majority of the House of Representatives, after rejection by the opposition-controlled House of Councillors.[13]
March 13 – Nonlife insurers Sompo Japan Insurance and Nipponkoa Insurance essentially agree to integrate their businesses in April 2010.[14]
March 14 – Two JMSDFdestroyers set sail for Somalia to patrol for pirates, embarking on the first overseas mission of its kind for Japan.[15]
April 21 – The Supreme Court rejects Masumi Hayashi's not-guilty plea and finalizes death sentence for killing four people with arsenic-laced curry at a local summer festival in Wakayama in 1998.[22]
April 28 – "EXPO Y150", celebrating 150th anniversary of the opening of the Port of Yokohama, is held until September 27.[23]
May 11 – Osaka Regional Court sentences Tetsuya Komuro to three years in prison with a five-year suspended sentence for fraud.[25]
May 15 – Fukuoka High Court sentences former Fukuoka city office worker who drank a "considerable amount of alcohol" before causing a traffic accident that killed three children in 2006, to twenty years in prison, dismissing a 7+1⁄2-year term ruled by Fukuoka Regional Court.[26]
June 1 – A modification of the law on sales of medications takes effect. The law classifies products into three categories and allows over-the-counter sales of two at convenience-stores and supermarkets with a registered sales agent present, while requiring a pharmacist to oversee sales of the third category. Convenience stores begin sales of vitamins, analgesics and cold remedies.[28]
June 1 – Amended Road Traffic Law, which requires 75 years or older people to take mandatory cognitive function tests upon renewal of their licenses, goes into effect.[29]
June 4 – Tokyo Public Prosecutors Office decides to release Toshikazu Sugaya, who allegedly sentenced indefinite imprisonment for kidnapping and murdering a 4-year-old girl in Ashikaga, Tochigi, after 17 years of imprisonment, due to the result of fresh DNA test which proved that his case was false imprisonment.[30]
June 16 – 10 climbers lost their lives in the Taisetsu mountain range in Hokkaido. Hokkaido Police raided the head office and a local branch of Amuse travel on suspicion of improper management of a guided tour on June 18.[32]
July 21 – A massive heavy rain, following devastate flood and landslide in Hofu, Yamaguchi, 18 people lives.[citation needed]
July 22 – Total Solar eclipse is observed in Iwo Jima and over the water around there. It was not observed from Akusekijima, in which supposed to have longest-lasting solar eclipse, due to stormy conditions over the island around the time of the total solar eclipse.[35]
August 3 – The first trial by jury for over 60 years, first time under the new Jury system, is started at the Tokyo Regional Court.[citation needed]
August 10 – A massive heavy rain, following devastate flood and landslide in Sayo, Hyogo, which killed 18 people.[citation needed]
August 11 – A strong earthquake with a magnitude of 6.5 struck Shizuoka Prefecture, killing one and more than 100 injured, part of the Tomei Expressway is collapsed due to landslide occurred right below.[37]
September 28 - A Japan Maritime Self-Defense Force (JMSDF) NAMCYS-11 a twin-engined turboprop transport crashed while landing at JMSDF Ozuki Air Field in Shimonoseki, Yamaguchi Prefecture, Japan. The landing in light rain, the aircraft suffered an overshoot of the runway and crashed through the airfield perimeter fence, crossing a service road and plunged nose-first into a rice field. The 11 JMSDF crew members of the aircraft were uninjured and the NAMC YS-11 aircraft suffered bent propellers.
September 29 - Toyota launches a massive recall on many vehicles of its own, including those of its luxury brand, Lexus, relating to floor mats and how they may interfere with the functioning of the gas pedal.
January 25 – Yamagata gubernatorial election: Mieko Yoshimura, supported by Democrats, Social Democrats and Communists as well as some national level Liberal Democrats, narrowly beats LDP-supported incumbent governor Hiroshi Saitō. Gifu gubernatorial election: Incumbent Hajime Furuta wins reelection against only one Communist challenger.
March 29 – Chiba gubernatorial election: Supported by parts of the Liberal Democratic Party, former actor Eiji Suzuki (stage name: Kensaku Morita) beats centre-left supported Taira Yoshida and three other contenders to succeed retiring two-term governor Akiko Dōmoto, a former Socialist Diet member.
April 12 – Former Akita city mayor Norihisa Satake wins the Akita gubernatorial election against DPJ-supported Hiroshi Kawaguchi and two other candidates. Three-term governor Sukeshiro Terata had retired to eventually turn to national politics in 2010.
July 5 – The Shizuoka gubernatorial election is held to elect a successor of Yoshinobu Ishikawa who had resigned over delays in the opening of the controversial Shizuoka airport. With support from centre-left parties, Heita Kawakatsu narrowly defeats centre-right supported former Councillor for Shizuoka Yukiko Sakamoto and two other candidates. In the Hyōgo gubernatorial election, governor Toshizō Ido is reelected with broad support from non-Communist parties.
July 12 – In the most populous prefecture of Tokyo, the LDP suffers a major defeat, losing its status as strongest party in the assembly for the first time since the 1960s. The loss increases the pressure on LDP president Tarō Asō to resign or call early elections for the national lower house.
August 30 – Ibaraki gubernatorial election: Masaru Hashimoto wins a fifth term against LDP supported Masato Obata and four other candidates.
October 25 – In the Miyagi gubernatorial election, governor Yoshihiro Murai clearly defeats DPJ supported Yasuo Endō and a Communist to win a second term in office.
November 8 – Former METI bureaucrat Hidehiko Yuzaki beats 4 other candidates in the Hiroshima gubernatorial election to succeed retiring Yūzan Fujita.
