A handle is provided with a main unit base having an engaging pin, a door base having a rotating shaft, a knob portion, and a rotation stopper. The knob portion has an engaging groove. The engaging groove has an open end. At the door-locking position, the engaging groove and the engaging pin become engaged with each other, and at the door-unlocking position, the engagement is released. When the knob portion is located at the door-unlocking position, the rotation stopper positions the knob portion such that the engaging pin is located inside an extension range of the open end. The engaging groove has a pushing surface, which pushes the engaging pin at the time of the displacement of the knob portion.