Nagano 3rd district (長野県第3区, Nagano-ken dai-sanku or 長野3区, Nagano sanku) is a single-member constituency of the House of Representatives, the lower house of the national Diet of Japan. It is located in central and eastern part of Nagano Prefecture and consists of Ueda City, Komoro City, Chikuma City, Saku City, Tōmi City, Minamisaku District, Kitasaku District, Chiisagata District and Hanishina District. As of December 2020, 400,529 eligible voters were registered in the district.

Yosei Ide, a Liberal Democrat, has represented this district since December 2014.

List of members representing the district Member Party Dates Electoral history Notes Tsutomu Hata New Frontier October 21, 1996 –December 26, 1996 Redistricted from the former 2nd district and Re-elected in 1996.Re-elected in 2000.Re-elected in 2003.Re-elected in 2005.Re-elected in 2009.Retired. Prime Minister of Japan (1994) Sun December 26, 1996 –January 23, 1998 Good Governance January 23, 1998 –April 27, 1998 Democratic April 27, 1998 –November 16, 2012 Yoshiyuki Terashima Democratic December 17, 2012 –November 21, 2014 Elected in 2012.Lost re-election. Lost re-election in the Hokurikushin'etsu PR block. Yosei Ide Innovation December 15, 2014 –March 27, 2016 Re-elected in 2014.Re-elected in 2017. Elected in 2012 in the Hokurikushin'etsu PR block.Elected in 2024 in the Hokurikushin'etsu PR block. Democratic March 27, 2016 –October 3, 2017 Kibō no Tō October 3, 2017 –May 7, 2018 Independent May 7, 2018 –December 21, 2019 LDP December 21, 2019 –October 9 2024 Takeshi Kōzu CDP Octoberber 29, 2024 –presentLost re-election in 2026 Yosei Ide LDPFebruary 8, 2026

Election results 2026 • 2024 • 2021 •2017 • 2014 • 2012 • 2009 • 2005 • 2003 • 2000 • 1996

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2024

2021

2017

2014

2012

2009

2005

2003

2000

1996

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