To provide a rolling support device having excellent durability even when used under severe lubricating conditions.

A roller 6 constituting a tappet roller bearing, and a support shaft 5 are manufactured by machining material formed of steel, into predetermined shape and then applying heat treatment including nitriding. Hardness is set to Hv650 or more in a surface layer forming the inner peripheral surface (a sliding contact surface) 6a of the roller 6, and the N content is set to 3.0 mass% or more and hardness is set to Hv700 or more in a surface layer part forming the outer peripheral surface 5a (a sliding contact surface) of the support shaft 5.