| Office1: | Minister of Foreign Affairs |
| Primeminister1: | Takeo Miki |
| Term Start1: | 15 September 1976 |
| Term End1: | 24 December 1976 |
| Predecessor1: | Kiichi Miyazawa |
| Successor1: | Iichirō Hatoyama |
| Office2: | Minister of State, Head of the Economic Planning Agency |
| Primeminister2: | Kakuei Tanaka |
| Term Start2: | 22 December 1972 |
| Term End2: | 25 November 1973 |
| Predecessor2: | Kiichi Arita |
| Successor2: | Tsuneo Uchida |
| Office3: | Minister of Foreign Affairs |
| Primeminister3: | Hayato Ikeda |
| Term Start3: | 8 December 1960 |
| Term End3: | 18 July 1962 |
| Predecessor3: | Aiichiro Fujiyama |
| Successor3: | Masayoshi Ōhira |
| Office4: | Chairman of the National Public Safety Commission |
| Primeminister4: | Shigeru Yoshida |
| Term Start4: | 1 July 1954 |
| Term End4: | 1 October 1954 |
| Predecessor4: | Office established |
| Successor4: | Naoshi Ohara |
| Office5: | Minister of Labour |
| Primeminister5: | Shigeru Yoshida |
| Term Start5: | 21 May 1953 |
| Term End5: | 16 June 1954 |
| Predecessor5: | Kuichiro Totsuka |
| Successor5: | Saburo Chiba |
| Office6: | Member of the House of Representatives |
| Term Start6: | 10 April 1946 |
| Term End6: | 18 February 1990 |
| Birth Date: | 1912 1, df=yes |
| Birth Place: | Nagano, Japan |
| Death Place: | Tokyo, Japan |
| Party: | Liberal Democratic Party |
| Children: | Kenji Kosaka |
| Alma Mater: | Hitotsubashi University |
was a Japanese politician who served two terms as foreign minister and as labour minister.
Hailing from Nagano Prefecture, Kosaka was born into a politician family on 23 January 1912.[1] [2] His grandfather, Zennosuke Kosaka, was the founder of the daily Shinano Mainichi and a politician. His father, Junzo Kosaka, was also a politician. His younger brother, Tokusaburo Kosaka, was a leading politician of the Liberal Democratic Party.[3] Zentaro Kosaka was a graduate of Tokyo University of Commerce (present-day Hitotsubashi University).[2]
After graduation, Kosaka began his career at the Mitsubishi Bank. Then he worked for Shin-Etsu Chemical which was established by his father, Junzo Kosaka.[2] Later he joined the Liberal Democratic Party.[4] In the party he was part of the Kōchikai faction headed by Hayato Ikeda.
Kosaka first became a member of the House of Representatives in 1946, being a representative for the Nagano Prefecture.[2] He served in the Lower House for 16 terms and held a variety of ministerial posts. On 6 September 1960, Kosaka visited Seoul, becoming the first Japanese cabinet member to visit South Korea since 1945.[5] He was appointed labour minister in the Yoshida Cabinet, and foreign minister in the cabinets of Hayato Ikeda and Takeo Miki.
Kosaka's first term as foreign minister was from 19 July 1960 to 18 July 1962. Assuming the post shortly after the massive Anpo Protests against the US-Japan Security Treaty, Kosaka's most pressing task was to restore good relations with the United States. Kosaka recalled, "In the immediate aftermath of the Security Treaty riots, repairing US-Japan relations was our single biggest concern."[6] To this end, Kosaka visited the United States several times and helped arrange a summit meeting between Prime Minister Ikeda and President John F. Kennedy in Washington D.C. in June 1961.[6]
In August 1966, Kosaka and Yoshimi Furui headed an eight-member LDP delegation to visit China.[7] They both held the views of right-conservatism, arguing for Japan's independence from the US and normalized relations with China.[7] After the visit, Kosaka developed a policy report, called the Kosaka Report, which was submitted to the LDP's policy affairs research council.[7]
In 1968, Kosaka stated his desire to visit Mongolia to search for the viability of economic assistance towards the country.[8] In 1970, Kosaka argued that Japan should declare a "no-war" notice in order to reduce tensions between Japan and China.[9] He was also the head of political affairs research committee in the LDP during the same period.[8] He also served as the head of economic planning agency during the term of the then Prime Minister Kakuei Tanaka.[2] On 24 July 1972, Tanaka also appointed him as chairman of the newly founded Council for the normalization of Japan-China relations in the LDP.[10] [11] The task of the council that consisted of 312 members was to reach a consensus, since the pro-Taiwan and pro-Peking factions over the whole peace treaty issue emerged in the party.[10] IN September 1972, Kosaka visited Pekin as special envoy of the prime minister Tanaka.[10]
Kosaka was secondly appointed foreign minister in 1976.[2] In 1976, he called for a reform of the UN security council at the UN general assembly.[12] At the beginning of the 1980s, he served as the chairman of the LDP's foreign affairs research council.[13] Kosaka retired from politics in 1990.[2]
Kosaka's son, Kenji Kosaka, is a LDP politician and former minister of education.[14] Kosaka participated his son's election campaign for the lower house in the Nagano district in 1990.[15]
Kosaka was awarded the U.N. peace prize in 1982.[2] The Chinese restaurant of Okura Hotel in Tokyo was named by Kosaka.[16]
Kosaka died of renal failure in Tokyo on 26 November 2000.[2] He was 88.[2]
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