A work machine handle device having a foldable handle is disclosed. As the handle is to be changed from a folded-up state to a use state, the handle is turned about a frame as a turning fulcrum. An actuating protuberance provided integrally to a turning member of a clamp body is pushed by a handle engaging/disengaging part provided to a front end of the handle, and the turning member is caused to turn. The handle engaging/disengaging part is held from either side and automatically restrained by a clamp mechanism. When the handle is changed from the use state to the folded-up state, a restraining mechanism is operated to release the engagement between the restraining mechanism and a distal end of the turning member. The turning member is turned by a return force of a spring provided to the clamp body, the handle engaging/disengaging part ceases to be restrained, and the handle can be folded up.