Shikoku proportional representation block

The Shikoku proportional representation block (Hirei [daihyō] Shikoku burokku (比例[代表]四国ブロック^?)) is one of eleven proportional representation (PR) "blocks", multi-member constituencies for the House of Representatives in the Diet of Japan. It consists of Shikoku region covering Tokushima, Kagawa, Ehime and Kōchi Prefectures. Following the introduction of proportional voting it elected seven representatives in the 1996 general election. When the total number of PR seats was reduced from 200 to 180, the Shikoku PR block shrunk to six seats.

With a district magnitude of six, Shikoku is the smallest PR block. The vote share necessary to obtain a seat is usually well above ten percent. In three elections after the consolidation of the LDP-DPJ-party system by the merger of the LP into the DPJ in 2001, only the top three parties were able to win seats in Shikoku. In 2012, the LDP recorded its worst result since the introduction of proportional party list voting and the DPJ vote share crashed by more than 25 percentage points, the newly created Japan Restoration Party managed to gain two proportional seats in Shikoku.

Party names are abbreviated as follows: (Romanisation of Japanese name in brackets):

Note: Party affiliations as of election day.

Following on from the LDP landslide win at the 2012 general election, in which the party won 12 of the 13 electorates in Shikoku plus two of the six seats from the PR list, the LDP maintained their dominant position in the region by retaining all 10 of their electorates (two electorates were abolished to address voter malapportionment) and gaining a seat on the PR list from the dissolved Japan Restoration Party (JRP).

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