In June 2006, Beppu was crowned the Japanese national champion in both the time trial and the road race.

On 28 September 2007, the Skil–Shimano professional cycling team announced that they had signed Beppu for an initial one-year contract.

He won the Combativity award in the final 21st flat stage from Montereau-Fault-Yonne to Paris Champs-Élysées.

[10] In February 2010 he finally started races with RadioShack at Omloop Het Nieuwsblad and Kuurne-Bruxelles-Kuurne.

[12] After two years with the team, Beppu left at the end of the 2013 season to join Trek Factory Racing.