Fine maneuverability of a motorcycle body is achieved by reducing a load on a handgrip at low speed, and a movement of the motorcycle body is stably maintained at high speed by increasing the load on the handgrip and thereby suppressing deflection of the handgrip.
A rotative steering damper is provided coaxially with a steering shaft, and a load of a handgrip is formed by causing a variable valve to generate damping force using rotation of the steering shaft. The damping force is variably controlled in response to motorcycle speed. The damping force is fixed to a minimum value C1 when the damping force is equal to or below first reference speed V1 on a low speed side, fixed to a maximum value C2 when the damping force is equal to or above second reference speed V2 on a high speed side, and variably controlled in response to motorcycle speed and acceleration in an intermediate speed range.