This paper examines the turnout of the gubernatorial elections from 1957 to 2005, with a focus on the influence of unified local elections, a coalition between political parties, and a split in the LDP. The findings are as follows; (1) The turnout of gubernatorial election is likely to be higher, when an assembly election is held simultaneously, (2) If there are many election districts by “no contest” in an assembly election, the turnout of the gubernatorial election tends to be lower, (3) The turnout of the gubernatorial election has a tendency to be higher when it is held on the same day of either the House of Representatives election or the House of Councilors election. However, even if a byelection of the House of Councilors is held on the same day, it does not effect the turnout of the gubernatorial election. (4) The turnout of the gubernatorial election is to be higher when it is held in the unified local election. However, the voter turnout of the gubernatorial election does not necessarily become higher in correspondence to the number of other gubernatorial elections, (5) The turnout is to be lower, when LDP and other political parties support same candidate, (6) Especially, the turnout will be lower when the LDP and the second party support the same candidate, (7) When the LDP is divided, the turnout of the gubernatorial election will be higher.
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