Japanese people witnessed a drastic change of government in 2009.The Democratic Party of Japan (DPJ) won the great victory at a General Election held in August.It secured 308 seats by itself and 322 seats including coalition parties seats among total 480 seats.As a result,the government changed from the Liberal Democratic Party (LDP) to the DPJ after the election.A unique electoral system,called Chusenkyokusei,which combines three to five member constituencies with the single vote plurality system has been in use from 1925 to 1993 in Japan.In this system,since the year 1955 when the LDP and the former Japan Socialist Party (JSP) were established respectively by mergers,Japan has experienced a relative stable political system called the post-1955 political system.In this period,the relationship between voters and parties were also stable.People in rural areas have been giving their supports to the LDP and the LDP handed out political favors to rural areas while people in urban areas gave their supports to the JSP and other left parties.The new system which consists of a mixed system of 300 seats for single member constituencies and 200 seats to be decided by proportional representation,was established in 1994,when the LDP went out of power temporarily.Since then,realignments of political parties progressed gradually and voters supports to parties also changed.The LDP won the last general election in 2005 and could extend supports to urban area by the former Prime Minister Koizumis successful election campaigns and performances.However,the LDP lost an election of the House of Councillors in 2007 and a general election in this year.In this way,fixed relationships between voters and parties in the post-1955 political system were slowly weakened after the new system was brought in.I speak a geography of the general election in this year and characteristics of changes of relationship of voters supports for parties.The LDP has gradually lost its supports from people through modernaization in rural areas.And Koizumi government during 2001-2005 promoted a structural reform and reduced public investment in rural areas.Therefore,strong relationship between voters and conservative politicians in rural areas collapsed rapidly during these several years.