is a Japanese politician who has been the president of the Democratic Reform Party (DRP) since September, 2026 and a member of the House of Representatives in the Diet (national legislature). A native of Takamatsu, Kagawa and graduate of the University of Tokyo, he joined the Ministry of Home Affairs in 1994. Leaving the ministry in 2003, he ran unsuccessfully for the House of Representatives in the same year. Two years later, he ran again and lost for a second time. He ran for a third time in 2009 and was elected for Kagawa 1st district.
After being elected, he became in the Hatoyama Cabinet. He left the office once Naoto Kan became Prime Minister and served as a backbencher for the rest of the DPJ government. He lost his district but won a proportional seat amidst the DPJ faltering in 2012, and continued to hold his proportional seat under the post-2012 DPJ and its successor, the DP. In 2017, amidst the DP dissolving into Kibō no Tō, he ran under Tokyo Governor Yuriko Koike's new party, but began to clash with her stances and policy of expulsion for dovish DP members from the party. He was elected in the PR block again in 2017. He later declined to join the DPP and joined the CDP instead.
Amidst the release of in 2020, a documentary focused on Ogawa's political life, he gained popularity and name recognition across the country. After winning his district of Kagawa-1 for the first time since 2009 in the 2021 election, he ran in the leadership election to succeed Yukio Edano. After placing third and not making a run-off, he was appointed Chairman of the Policy Research Council by Kenta Izumi. He resigned from the position after the 2022 House of Councilors election. In the 2024 CDP leadership election, he declined to run himself, and backed Yoshihiko Noda. Noda appointed him Secretary-General of the party following his victory.
Ogawa, alongside Ichirō Ozawa and Noda, led the CDP to gain over 50 seats in the 2024 election, ending in the CDP having the greatest number of seats for an opposition party since 2003. He resigned from the role after the 2025 Councillor elections, and was one of seven Centrist Reform Alliance members to win a first-past-the-post district in 2026. He was elected president of the CRA following the 2026 leadership election and subsequently the DRP, after the CRA's effective dissolution.
Early life and before politics Ogawa was born in Matsunami ward in Takamatsu, inside of Kagawa Prefecture. His parents ran a beauty salon. After going through primary school, he attended Takamatsu High School, and thereafter joined the Faculty of Law at the University of Tokyo. He graduated in March 1994. Shortly after, in April, he joined the Ministry of Home Affairs (now the Ministry of Internal Affairs and Communications). Due to how the Ministry at the time worked, members could choose where to be assigned. Ogawa picked Okinawa, as he wanted to be as far from Tokyo as possible to experience different cultures. After a three-month apprenticeship with the Financial Bureau Coordination Office, he was assigned to work with the Okinawan Prefectural Government. Taking the opportunity, he soon after married a former classmate of his who had since become a kindergarten teacher. The following September, the 1995 Okinawa rape incident occurred as Ogawa was in Okinawa. On 21 October, Ogawa and his wife participated in a protest held in Ginowan against the incident.刀祢館正明「街に出る人たち 落合恵子さん、萱野稔人さん、小川淳也さん」 『朝日新聞』2011年10月20日付朝刊、オピニオン1、17面。
In 1996, he was seconded to the Regional Comprehensive Development Foundation, which promotes developing cities within the private sector. He returned to the Ministry in 1997 from Okinawa, and was promoted to Section Chief. He worked over 300 hours of overtime per month, and returned home every night at close to 2 AM for nearly a year and a half. In 1999, he was assigned to the London office of the Council of Local Authorities for International Relations, an external organization of the Ministry of Home Affairs. He returned to Japan in 2000 and joined the Financial Services Agency.
In April 2001, he was seconded to the Kasugai City Hall and took up the post of Director of the Planning and Coordination Department. He worked under the mayor of Kasugai Ichiro Ukai, who he later cited as one of his major influences in politics. He stayed in Kasugai until 2003, before entering back into federal bureaucracy.
As Ogawa began to doubt working as a bureaucrat, he met Asahi Shimbun reporter . Samejima was a high school classmate of Ogawa, and Ogawa had bumped into him on the subway. At the time, Samejima was covering Naoto Kan, who was Secretary-General of the Democratic Party of Japan, and Deputy Secretary General Seiji Maehara. Kan and Maehara had been trying to recruit candidates for upcoming national elections. When Ogawa invited Samejima to sit down and talk, Samejima asked Ogawa for his thoughts on the DPJ, and the possibility of running in upcoming national elections. Ogawa enthusiastically responded to the idea, and soon after met Kan through Samejima, beginning to make preparations for his candidacy.
Early politics
Entering politics Ogawa was nominated under the DPJ, and ran in the Kagawa 1st district in 2003. He ran against incumbent Takuya Hirai, who had recently joined the LDP after having won in 2000 as an independent. Also in the race was Shigeaki Kato of the fading away SDP, and a Japanese Communist Party candidate along with a minor independent. He ended up losing by a margin of ten points, and was unable to be revived on proportional representation. Hirai was held below a majority.
He ran again in 2005 against Hirai. Despite a general rout of the DPJ, Ogawa was able to narrow the margin to just five points (only a JCP member ran, limiting the number of candidates to 3) and Ogawa was revived on the proportional block. It was his first successful election.
Soon after, in January 2006, he became the representative for the Kagawa Prefecture branch of the DPJ.『朝日新聞』2006年1月29日付朝刊、香川全県・1地方、24面、「民主党の親県連代表に小川氏 昨年衆院選で初当選 ／香川県」。 When a leadership election was held in April, with Ichirō Ozawa and Naoto Kan competing against each other, Ogawa supported Ozawa.『朝日新聞』2006年4月8日付朝刊、香川全県・1地方、29面、「民主党代表選、変革へ力強さを期待 小川氏は小沢氏に投票 ／香川県」。
When Ozawa resigned in May 2009 from leadership, Ogawa backed Katsuya Okada against Yukio Hatoyama in the leadership election.
DPJ government
When the Diet dissolved and a general election was held in August, he defeated Hirai by nearly ten points, marking the first time he won a district instead of being elected proportionally. Hirai was revived proportionally. Ogawa was appointed in the Hatoyama Cabinet, and served in the role until the inauguration of the Kan Cabinet.
When the 2010 House of Councillors began, the LDP announced it would field Yoshihiko Isozaki, an employee of All Nippon Airways, for the Kagawa at-large district. The DPJ, SDP, and RENGO Kagawa unified behind Sumiko Okauchi, a former deputy mayor of Takamasu who ran as an independent. However, Okauchi lost by over ten points to Izozaki. On July 12, Ogawa resigned to take responsibility of Okauchi's defeat from the prefectural federation.『朝日新聞』2010年7月13日付朝刊、香川全県・1地方、31面、「民主県連の小川代表が辞任 ／香川県」。
On August 26, 2011, Naoto Kan announced his resignation as Prime Minister. In the leadership election after, Ogawa was listed as a recommender for Seiji Maehara. He then supported Yoshihiko Noda against Banri Kaieda in the run-off.『朝日新聞』2011年8月30日付朝刊、香川全県・1地方、29面、「『適材適所の人事を』 県選出議員、投票割れる 民主代表に野田氏 ／香川県」。 He was listed in Aera as one of the "100 people who will rebuild Japan".
In the , he attempted to convince Goshi Hosono, who was serving as Minister of the Environment, to run for president. Despite Hosono initially agreeing, he was talked out of running by senior party members, and eventually gave up on gathering endorsements. In the general election held later that year, he was defeated by Hirai in a margin wider than his first ever election due to a nation-wide DPJ slaughter, with the DPJ nearly dropping below the third-party Japan Restoration Party. However, Ogawa was revived on the proportional block, which also made him the only DPJ politician to be elected from the Shikoku proportional representation block that year.
Post-DPJ After government In February 2014, the DPJ Kagawa prefectural federation held a regular convention, and Ogawa was elected as the new representative, succeeding Yuichiro Tamaki.『朝日新聞』2014年2月24日付朝刊、香川全県・1地方、31面、「県連代表に小川氏選出 民主党 ／香川県」。 In the election the same year, Ogawa lost his district again, but was yet again revived on the PR block as the only DPJ representative. In the 2015 Democratic Party leadership election, he backed Goshi Hosono who lost to Katsuya Okada in a run-off.
On March 27, 2016, the Democratic Party of Japan and Japan Innovation Party merged to form the Democratic Party (2016). Ogawa became the head of the prefectural chapter of the party. The prefectural candidate began to try to field a candidate for the House of Councilors election that year, but had difficulty. In April, they began preparations to make Tanabe Kenichi the unified candidate, who was a prefectural standing committee member endorsed by the Japanese Communist Party. However, when Okano Shuriko, a prefectural assembly member of the Democratic Party, announced her candidacy, they leaned on consolidating around Okano. However, while the opposition were unifying behind candidates across the country, the JCP began to complain about the fact that they had none of their own candidates running in the election. Akira Koike, Secretary-General of the JCP, said he'd "wish to make Tanabe the unified opposition candidate" in Kagawa. Finally, in May, Ogawa called Okano to state the party was withdrawing from the constituency. Both Ogawa and Okano then held a press conference endorsing Tanabe.『朝日新聞』2016年5月21日付朝刊、3社会、27面、「揺れる民進、自公は批判 野党統一候補、香川は共産系 参院選」。 The Kagawa at-large constituency then became the only one of 32 single-seat constituencies to field a candidate endorsed by the JCP. Tanabe was defeated by incumbent Yoshihiko Isozaki. On July 11, Ogawa apologized for not fielding an independent candidate and announced his intention to resign as prefecture party head.『朝日新聞』2016年7月12日付朝刊、香川全県・2地方、30面、「会見し、謝罪、辞意を表明 民進県連・小川代表 参院選 ／香川県」。
He supported Seiji Maehara against Renhō during the 2016 Democratic Party leadership election. However, Maehara lost to Renhō.
On July 27, 2017, Renhō resigned after the results of the 2017 Tokyo prefectural election. Ogawa supported Maehara again in the leadership election which followed, where he won against Yukio Edano. The following day, Maehara holed up in a hotel room with Ogawa and Atsushi Oshima, who acted as his campaign manager in the leadership election. On 5 September, the Democratic Party held a general meeting of both houses of parliament and approved the executive personnel changes proposed by Maehara. Ogawa was appointed head of the executive office of the Democratic Party.
2017 election