THROTTLE DEVICE FOR ENGINE

The present invention provides a throttle device for an engine enabling an operation of fitting a support shaft supporting an intermediate gear into a positioning hole and an operation of causing the intermediate gear and a counterpart gear to mate with each other to be easily performed when a throttle body-side assembly and a gear cover-side assembly, which have individually been assembled, are coupled to each other. In the throttle device, a driven gear of a throttle shaft a driving gear of a motor and an intermediate gear supported by a support shaft are accommodated between a throttle body-side assembly and a gear cover-side assembly the support shaft has one end secured to a gear case of the throttle body-side assembly a positioning hole into which the other end of the support shaft is inserted with the coupling between the assemblies and is formed in a gear cover of the gear cover-side assembly and a projecting length L of the other end of the support shaft from an end surface of the intermediate gear is set to be longer than a projecting length L of the driving gear from an opening surface of the positioning hole