Yamanashi 1st district

Yamanashi 1st district (山梨[県第]1区, Yamanashi[-ken dai-]ikku) is a single-member electoral district for the House of Representatives, the lower house of the National Diet of Japan located in western Yamanashi Prefecture.

After the last House of Representatives election under the old system in 1993, Representatives from Yamanashi included Liberal Democrat Eiichi Nakao, Socialist Azuma Koshiishi and reformist Sakihito Ozawa.

In the 2000 Representatives election, Ozawa challenged Nakao and unseated him.

He held onto the seat until 2012 when he joined the Japan Restoration Party and lost the district to Liberal Democratic newcomer Noriko Miyagawa, a former junior high school teacher.

Yamanashi lost one electoral constituency in reapportionment in 2013.