A native of Oyama, Tochigi and graduate of Keio University, he was elected to the first of two terms in the House of Councilors in 1983 and then to the House of Representatives for the first time in 1993. After losing his seat in 1996 as a member of the New Frontier Party, he was re-elected in 2000 as a member of the Liberal Democratic Party (LDP). He later joined the DPJ. He married the daughter of writer Sohachi Yamaoka and was adopted into the family.
In September 2011 he was appointed as chairman of the National Public Safety Commission and Minister of State for Consumer Affairs and Food Safety in the cabinet of newly appointed Prime Minister Yoshihiko Noda.
In December 2011 he was the subject of a censure motion from the opposition LDP for failing to declare receiving ¥450,000 from a health food company allegedly involved in a pyramid scheme in 2008, and ¥2.54 million from other organizations involved in pyramid schemes between 2005 and 2008. As consumer affairs chief he was responsible for the Consumer Affairs Agency, which among other things is responsible for protecting consumers against pyramid schemes. Yamaoka said he has returned all the money to the donors. In the cabinet reshuffle of January 13, 2012 he was replaced in both of his cabinet roles by Jin Matsubara.
- Japan Times, "Cabinet Profiles: Noda Cabinet", 3 September 2011, p. 3.
- Fukue, Natsuko, "Despite pyramid sales donations, new consumer chief vows to run tight ship", Japan Times, 16 September 2011, p. 3.
- The Japan Times Upper House censures ministers - Ichikawa, Yamaoka censured in Diet December 10, 2011 Retrieved on August 16, 2012
- The Japan Times New Noda Cabinet on tax push January 14, 2012 Retrieved on August 16, 2012
- 政治家情報 〜山岡 賢次〜. ザ･選挙 (in Japanese). JANJAN. Archived from the original on 2007-12-03. Retrieved 2007-10-16. External link in
- Official website in Japanese.
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