A tiller handle includes: a throttle shaft including first shaft and the second shaft; a conversion mechanism configured to convert rotation of the first shaft into a rectilinear motion of the throttle cable; an engagement pin provided in the second shaft; and a restriction member (shift arm) engaged with the engagement pin depending on a position of a selector in synchronization with the selector to restrict rotation of the second shaft in a throttle valve open direction. The first shaft and the second shaft are configured to relatively rotate each other only by a predetermined angle.