The is a constituency of the House of Councillors that elects Councillors to represent Osaka Prefecture in the National Diet of Japan. From 1947 the district has elected three Councillors every three years by single non-transferable vote for six-year terms, such that there are six Councillors representing the district in the 242-member house. A revision to the Public Officers Electoral Law in 2012 increased the district's representation so that four Councillors were elected at the July 2013 election which will give the district a total eight Councillors by 2019.
The district has 7,140,578 registered voters (as of September 2015), making it the third-largest district behind the Tokyo and Kanagawa districts. The current Councillors for the district are:
Elected Councillors class of 1947 electionyear class of 1950 – Tetsuo Iwaki(Democratic) Masakazu Morishita(Socialist Party) Mitsuji Nakai(Democratic) 1947 Gisen Sato (JLP) Shinzo Ōya (JLP) Shigeo Murao(Japan Socialist) – 1950 Gisen Sato (Liberal) Shinzo Ōya (Liberal) Fukuzo Nakayama (Ryokufūkai) Haruji Mizobuchi (Liberal) 1951 by-el. Masakazu Morishita(Right Socialist) Tokuji Kameda(Left Socialist) 1953 1956 Gisen Sato (LDP) Shigeo Tsubaki(Japan Socialist) Giichiro Shiraki (Ind.) Mitsuzo Ōkawa (LDP) 1957 by-el. Vacant 1959 by-el. Mitsuzo Ōkawa (LDP) Bunzo Akama (LDP) Shigeo Murao(Socialist) Tokuji Kameda(Socialist) 1959 1962 Fukuzo Nakayama (LDP) Fujio Tashiro (Komeito) 1965 1968 Taro Nakayama (LDP) Shigeo Murao(Socialist Party) Giichiro Shiraki (Komeito) Shizuko Sasaki(Socialist) 1971 Takeko Kutsunugi(Communist) 1973 by-el. 1974 Atsushi Hashimoto(Communist) Tai Morishita (LDP) 1977 1980 Eiichi Nakamura (Ind.) Knock Yokoyama (Ind.) 1983 1986 Kiyoshi Nishikawa (Ind.) Takeko Kutsunugi(Communist) Akinori Mineyama (Komeito) Kazutaka Tsuboi (LDP) 1987 by-el. Hidekatsu Yoshii(Communist) 1988 by-el. Kazuyoshi Shirahama (Komeito) Takashi Tanihata(Socialist) 1989 1992 Kazutaka Tsuboi (LDP) Eiichi Yamashita (Komeito) Yoshiki Yamashita(Communist) Kazuyoshi Shirahama(New Frontier) Shuzen Tanigawa (LDP) 1995 1998 Takeshi Miyamoto(Communist) Takashi Yamamoto (DPJ) Kazuyoshi Shirahama (Komeito) 2001 2004 Issei Kitagawa (LDP) Motoyuki Odachi (DPJ) Satoshi Umemura (DPJ) 2007 2010 Hirotaka Ishikawa (Komeito)Toru Azuma (Ishin) Kotaro Tatsumi(Communist) Hisatake Sugi (Komeito) Takuji Yanagimoto (LDP) 2013 2016 Rui Matsukawa (LDP) Hitoshi Asada (Ishin) Kaori Takagi (Ishin)Mizuho Umemura (Ishin)Fusae Ohta (LDP)20192022Sasaki Rie (Ishin)Futoshi Okazaki (Ishin) Chisato Miyade (Sanseito) 2025 Notes:
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