The is a constituency of the House of Councillors in the Diet of Japan. It consists of Nagasaki Prefecture and elects two Councillors, one every three years by a first-past-the-post system for a six-year term. In the first election in 1947, Nagasaki like all districts used single non-transferable vote to elect both its Councillors in one election. Similar to other small, rural Kyushu prefectures, it is a "conservative kingdom" in favor of the LDP. Since the Democratic Party folded, LDP candidates have consistently won with over 50% of the vote.

Single-member districts (ichinin-ku) for the House of Councillors often play a decisive role for the outcome of elections as little swing in votes is required to achieve a change of the Councillors elected there. Under the 1955 System Nagasaki voted consistently for conservative candidates until the landslide election of 1989 that led to a "twisted parliament" (nejire kokkai: opposition control of the House of Councillors). Following the party realignments of the 1990s when reformist conservative and liberal parties and ultimately the Democratic Party replaced the Socialists as the main opposition to the LDP, Nagasaki became a more closely contested potential swing district.

Elected Councillors Class of 1947 Election year Class of 1950 #1(1947: #1, 6-year term) #1(1947: #2, 3-year term) Shigeo Fujino (Indep.) 1947 Takeo Shimizu (JSP) † 1948 by-el. Moriichi Kadoya (DP) 1950 Shun'ichirō Akiyama (LP) Shigeo Fujino (Yoshida LP) 1953 1956 Shun'ichirō Akiyama (LDP) Shigeo Fujino (LDP) 1959 1962 Kan'ichi Kubo (LDP) # Naozō Taura (LDP) † 1965 Tatsuhiko Tatsuta (JSP) w/o votekuriage-tōsen: 2nd ranking Tatsuta was elected without vote because Taura had died within three months of the regular election. 1968 1970 by-el. Takiichirō Hatsumura (LDP) Teiji Nakamura (LDP) 1971 1974 1977 1980 Hiroshi Miyajima (LDP) 1983 1986 Toshiko Shinozaki (JSP) 1989 1992 Sōichirō Matsutani (LDP) Tadashi Taura (NFP) 1995 1998 Tadashi Taura (LDP) 2001 2004 Tadashi Inuzuka (DPJ) Yukishige Ōkubo (DPJ) 2007 2010 Genjirō Kaneko (LDP) Yuichiro Koga (LDP) 2013201620192022Keisuke Yamamoto (LDP)

#: resigned to contest the 1970 Nagasaki gubernatorial election; †: died in office

Election results

References House of Councillors: Alphabetical list of former Councillors