2009 Japanese general election

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All 480 seats in theHouse of Representatives 241 seats needed for a majority
Turnout	69.19% (1.70pp; Const. votes) 69.19% (1.73pp; PR votes)
First party Second party Third party   Leader Yukio Hatoyama Tarō Asō Akihiro Ota Party Democratic LDP Komeito Last election 113 seats 296 seats 31 seats Seats before 115 300 31 Seats won 308 119 21 Seat change 195 177 10 Constituency vote 33,475,335 27,301,982 782,984 % and swing 47.43% (10.99pp) 38.68% (9.09pp) 1.11% (0.33pp) Regional vote 29,844,799 18,810,217 8,054,007 % and swing 42.41% (11.39pp) 26.73% (11.45pp) 11.45% (1.80pp)   Fourth party Fifth party Sixth party   Leader Kazuo Shii Mizuho Fukushima Yoshimi Watanabe Party JCP Social Democratic Your Last election 9 seats 7 seats Did not exist Seats before 9 7 4 Seats won 9 7 5 Seat change New Constituency vote 2,978,354 1,376,739 615,244 % and swing 4.22% (3.03pp) 1.95% (0.49pp) 0.87% (New) Regional vote 4,943,886 3,006,160 3,005,199 % and swing 7.03% (0.22pp) 4.27% (1.22pp) 4.27% (New)
Districts and PR districts shaded according to winners' vote strength
Prime Minister before election Tarō Asō LDP ElectedPrime Minister Yukio Hatoyama Democratic

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General elections were held inJapan on August 30, 2009 to elect the 480 members of theHouse of Representatives. The oppositionDemocratic Party of Japan (DPJ) defeated theruling coalition –Liberal Democratic Party (LDP) andNew Komeito Party – in alandslide, winning 221 of the 300 constituency seats and receiving 42.4% of the proportional block votes for another 87 seats, a total of 308 seats to only 119 for the LDP (64 constituency seats and 26.7% of the proportional vote).^[1][2][3]

Under theConstitution of Japan, this result virtually assured DPJ leaderYukio Hatoyama would be the nextprime minister of Japan. He was formally named to the post on September 16, 2009.^[4] Prime MinisterTarō Asō conceded late on the night of August 30, 2009, that the LDP had lost control of the government, and announced his resignation as party president.^[5] Aleadership election was held on September 28, 2009.

The 2009 election was the first time sinceWorld War II that voters mandated a change in control of the government to an opposition political party.^[6] It marked the worst defeat for a governing party in modern Japanese history, was only the second time that the LDP had not been able to form a government after an election since its formation in 1955, and was the first time that the LDP lost its status as the largest party in the lower house; the only other break in LDP control since 1955 had been for a 3-year period from 1993 to 1996 (first 11 months in opposition, then participating in a coalition government underTomiichi Murayama).^[7]

The last general election took place in2005 in which the LDP, led by popular prime ministerJunichiro Koizumi, received 38.2% of the proportional block votes and 47.8% of the district votes cast (the next largest party, the DPJ, received 31% in the proportional and 36.4% in the district vote). Due to the characteristics of theJapanese election system, the LDP ended up with 296 seats in the Lower House (61.6%), which enabled Koizumi to complete the privatization ofJapan Post. Since then Japan had three further prime ministers (Shinzō Abe,Yasuo Fukuda andTarō Asō) who came to power without there being a general election.

On September 1, 2008, Yasuo Fukuda abruptly announced he was retiring as leader. Taro Aso won the subsequentLDP leadership election, which was held on September 22, 2008.^[8] Media sources speculated that, in the wake of a recent change in leadership, Prime Minister Taro Aso might call elections in late October or early November 2008 while his popularity was still high.^[9]

There were expectations that the steady decline and numerous scandals of the LDP might lead to the complete extinction of the party and the creation of a new political system, with actual ideologically coherent parties emerging instead of the current system of a shared interest in power with stark ideological differences.^[10]

In late June 2009 there were rumours of a planned election date in early August 2009.^[11] Inprefectural elections in Tokyo, the LDP again lost a lot of seats and was for the first time since 1965 not the largest party in the prefectural assembly. The next day, Aso confirmed these rumours by calling for an election on August 30, 2009.^[12]

As soon as the election was called, a campaign was underway by a group of LDP Diet Members to replace Aso as leader. Fully one-third of the parliamentary party (including finance ministerKaoru Yosano) were reported to have signed a petition calling for an urgent party meeting to discuss the issue. The BBC reported LDP critics of Aso asserting that an election with him still as leader would be "political suicide".^[13] Prime Minister Aso dissolved the House of Representatives on July 21, 2009.^[14] The official campaign started on August 18, 2009.^[15]

Former LDP ministerYoshimi Watanabe announced the foundation of a new party,Your Party, on August 8, 2009.^[16]

The DPJ's policy platforms include: a restructuring of civil service; a monthly allowance for families with children (at 26000 yen per child); a cut in thefuel tax; income support for farmers; free tuition for public high schools; the banning oftemporary work in manufacturing;^[17] raising the minimum wage to 1000 yen; and the halting of any increase in sales tax for the next four years.^[15][18][19]

The LDP's policy platforms are similar to the DPJ's. ANew York Times article on August 28, 2009 noted both platforms offer little on economic policies.^[20]

Before the dissolution of the lower house, National weekly magazines had been citing analysts predicting a big loss for the ruling coalition which held two-thirds of the seats in the House of Representatives. Some (e.g.,Shūkan Gendai^[21]) warned that the LDP could lose as much as half of that. Many based their predictions on the low approval rating of the Prime Minister Taro Aso and the devastating loss that the LDP suffered in the earlier prefectural election in Tokyo. On August 20 and 21, 2009,Asahi Shimbun andYomiuri Shimbun, leading national newspapers, andNikkei Shimbun, a financial daily, reported that the DPJ was poised to win over 300 of the 480 contested seats.^[22][23][24]

On August 22, 2009,Mainichi Shimbun went further to predict that the DPJ could win over 320 seats, meaning almost all DPJ candidates would win.^[25] Mainichi noted that the DPJ appeared to be doing well in the western part of Japan, a traditional stronghold of the LDP, and that the LDP could lose all of its single-member constituency seats in 15 prefectures, includingHokkaidō,Aichi, andSaitama.^[26] Also, according to Mainichi, theJapanese Communist Party would probably retain its previous 9 seats, while the Komeito Party and theSocial Democratic Party might lose some of their shares.

According to a poll conducted on August 22, 2009 by theYomiuri Shimbun, Japan's largest newspaper, 40 percent said they would vote for the DPJ, while 24 percent for the LDP.^[27]

The DPJ swept the LDP from power in a massive landslide, winning 308 seats (out of a total of 480 seats), while the LDP won only 119 seats^[1] - the worst defeat for a sitting government in modern Japanese history. This was a marked contrast to the1993 election, the only other time the LDP has been forced into opposition status. In that election, the LDP remained by far the largest party in the House with well over 200 seats, despite losing its majority. However, in the 2009 election the LDP was nearly 200 seats behind the DPJ. Of 83Koizumi Children who became new LDP representatives in 2005, only 10 were reelected. The unprecedented number of urban voters won by Koizumi's 2005 landslide mostly abandoned the LDP in this election.^[30]

The DPJ won a strong majority in the House of Representatives, thus virtually assuring that Hatoyama would be the next prime minister. Under the Constitution, if the House of Representatives and the House of Councilors cannot agree on a choice for prime minister, the choice of the House of Representatives is deemed to be that of the Diet. Hatoyama was nominated as prime minister on September 16 and formally appointed later that day byEmperor Akihito.

However, the DPJ was just short of a majority in the House of Councillors, and fell just short of the 320 seats (a two-thirds majority) needed to override negative votes in the upper chamber. Hatoyama was thus forced to form a coalition government with theSocial Democratic Party andPeople's New Party to obtain a majority.^[31]

There were a number of factors at play in the DPJ's unprecedented success. In addition to the unpopularity of LDP politicians and some of its policies, such as medical policies and 2000'sneoliberal economic reforms, leading to widening income inequality, Japanese politics had seen a declining importance in local support groups (koenkai) which had previously allowed local LDP politicians to stay in power even if the incumbent prime minister or the LDP was suffering from low approval ratings. The DPJ also benefited from being a large and unified opposition party unlike in the past when the opposition tended to be splintered and lead tovote splitting losses for the opposition; in addition, theJapanese Communist Party, which normally fields candidates in every single district, fielded a historically low number of candidates, leading to a slight increase in votes for the DPJ in single-seat constituencies.^[30]

Party		Proportional			Constituency			Total seats	+/–
		Votes	%	Seats	Votes	%	Seats
	Democratic Party of Japan	29,844,799	42.41	87	33,475,335	47.43	221	308	+195
	Liberal Democratic Party	18,810,217	26.73	55	27,301,982	38.68	64	119	−177
	New Komeito Party	8,054,007	11.45	21	782,984	1.11	0	21	−10
	Japanese Communist Party	4,943,886	7.03	9	2,978,354	4.22	0	9	0
	Social Democratic Party	3,006,160	4.27	4	1,376,739	1.95	3	7	0
	Your Party	3,005,199	4.27	3	615,244	0.87	2	5	New
	People's New Party	1,219,767	1.73	0	730,570	1.04	3	3	−1
	New Party Nippon	528,171	0.75	0	220,223	0.31	1	1	0
	Happiness Realization Party	459,387	0.65	0	1,071,958	1.52	0	0	New
	New Party Daichi	433,122	0.62	1				1	0
	Reform Club	58,141	0.08	0	36,650	0.05	0	0	New
	Essential Party	7,399	0.01	0				0	New
	Freeway Club Party [ja]				2,360	0.00	0	0	New
	Forest Sea Party				1,520	0.00	0	0	New
	Smile Japan Party				987	0.00	0	0	New
	World Economic Community Party				718	0.00	0	0	New
	Independents				1,986,056	2.81	6	6	−12
Total		70,370,255	100.00	180	70,581,680	100.00	300	480	0
Valid votes		70,370,255	97.74		70,581,680	98.01
Invalid/blank votes		1,628,866	2.26		1,435,587	1.99
Total votes		71,999,121	100.00		72,017,267	100.00
Registered voters/turnout		104,057,361	69.19		104,057,361	69.21
Source:Ministry of Internal Affairs and Communications,Tsukada,CLEA

Had the parties nominated a sufficient number of candidates on their proportional "block" lists, the election result would have given the DPJ two additional seats in Kinki, the YP seat in Kinki, and one in Tōkai. In Kinki, two seats went to the LDP, one to Kōmeitō, and one in Tōkai to the DPJ.^[32] For the same reason, one Democratic Kinki proportional seat that had fallen vacant in 2010 (previously held byMitsue Kawakami) could not be filled until the next general election.

In March 2011, the Supreme Court decided that the malapportionment of electoral districts in the 2009 election had been in breach of theConstitution of Japan. As in previous such rulings (as occurred in the aftermath of the elections of 1972, 1980, 1983 and 1990), the election result is not invalidated, but the vote weight disparity must be reduced by theNational Diet soon. The 2009 election was the first House of Representatives election ruled unconstitutional sincethe 1994 electoral reform and the introduction ofparallel voting insingle-member districts and proportional "blocks".^[33] The two major parties additionally wished to use the reform to significantly reduce the number of proportional seats, as both had promised in their 2009 campaigns, but met resistance from smaller parties that depended on proportional seats to bolster their numbers.^[34][35]

• List of districts of the House of Representatives of Japan
• 2009 Tokyo prefectural election
• 2009 Yokohama mayoral election

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