He was educated at Tokushima Prefectural Johoku High School and was graduated in economics at Doshisha University.

His first game was at 19 October 1980, in a 23–3 loss to France XV, in Toulouse and his last came at 26 September 1992, in a 37–9 win over Hong Kong, in Seoul, for the Asian Championship.

He was replaced this time by Seiji Hirao as the captain, but played once again in the three matches, scoring a try in the 32–16 defeat to Ireland, at 9 October 1991, in Dublin.

Currently, he is affiliated to Kobelco Career Development and he is also the chairman of the nonprofit organization Heroes.

Gospellers' hit song "Towa ni", which composed by Takeshi Senoo (a supporter of Kobelco Steelers), who dedicated it to Hayashi at the time when he retired.