PURPOSE: To prevent a wire harness from being entangled by boring an insertion hole for a wire harness provided on a handle frame fitting pedestal over a semicircle or more in the rotation direction.

CONSTITUTION: The lower fixed bed 9 of a rotary pedestal 4 is formed in a nearly circular shape, and an insertion hole 21 for a wire harness 15 is bored at the center. The front edge section 21 of the insertion hole 21 is bulged in the inside direction and welded and fixed to the support tube 20 of a speed shift shaft. The insertion hole 21 is bored over a semicircle or more centering the support tube 20, and an opening portion is made large. When handle frame 5 is eccentrically fixed to a lower fixed base bed 9, the opening shape of the insertion hole 21 is made a circular arc shape centering the support tube 20. When the handle frame 5 is rotated, the wire hardness 15 is prevented from being twisted or entangled, and the resistance of a clutch or a throttle connected with the wire hardness 15 during operation is reduced.