Hoshino participated in two Formula One Grands Prix, debuting on 24 October 1976 at the Japanese Grand Prix, making him - along with compatriots Noritake Takahara and Masahiro Hasemi - the first Japanese driver to start a Formula One Grand Prix. Driving a Tyrrell-Ford for Heros Racing, he ran as high as fourth, but retired having used up his tyre supply. He returned in 1977 and once again entered the Japanese Grand Prix driving for Heros Racing. He finished in eleventh place driving a year-old Kojima-Ford. He scored no championship points in his Formula 1 career.