Taku Yamamoto

, legally , is a Japanese former politician of the Liberal Democratic Party who served as a member of the House of Representatives from 1990 to 1996 and again from 2003 to 2021. He is the husband of Sanae Takaichi, who has served as Prime Minister of Japan and President of the Liberal Democratic Party since 2025; thus, he became the first male prime ministerial spouse.

Political career Yamamoto was a member of the House of Representatives until 2021, when he lost his seat. A native of Sabae, Fukui and graduate of Hosei University. He was elected to the first of his two terms in the assembly of Fukui Prefecture in 1983, and to the House of Representatives for the first time in 1990. After losing his seat in 1996, he ran unsuccessfully for the governorship of Fukui Prefecture in 1999. He was re-elected to the House of Representatives in 2003.

Personal life He married Sanae Takaichi, a fellow member of the House of Representatives, in 2004. Yamamoto's younger brother served as a parliamentary aide in her office. They agreed to a divorce in July 2017, with Takaichi citing differing political views and aspirations as the reason for the divorce. However, they rekindled their marriage in December 2021, and he adopted Takaichi's surname. She became president of the Liberal Democratic Party

Health Yamamoto was diagnosed with prostate cancer in 2024 and suffered from a cerebral infarction in 2025, leaving the right side of his body unable to move. Takaichi serves as his carer.