A spring damper (35) provided to the inner side of a coil spring (49) comprises a main body part (36) having an outside diameter (D36) smaller than the inside diameter (Di49) of a spring wire (493) of the coil spring, and an outer-side convex part (37) provided to the radially outer side of the main body part and having a distal end (371) positioned farther radially outward than a cylindrical virtual plane (VP49) passing through the center of the spring wire. When the coil spring is compressed by the pressing of an accelerator pedal by a driver, the outer-side convex part positioned between adjacent spring wires prevents the spring wires from colliding against each other.
