To prevent the breakage such as bending in a lock plate even when violent pull-out force is applied thereto from the outside.

A flange section 26 is provided to the front end of a sleeve 25 inserted into a handle case 21 having an interlocking recess section 23 on the inside circumferential surface in a turntable manner, an opening is provided to the sleeve 25, and a notch recess section 31 communicating with the opening is provided to the inside of the flange section 26. An insertion hole is opened in a handle inserted into the sleeve 25 in an axial movement, a lock plate inserted into the insertion hole is urged to a direction interlocking with the engaging recess section 23, and a reinforcing section 52 capable of coming into contact with the inside circumferential surface of the handle case 21 through the opening is provided to an area including the insertion hole of the circumferential surface in the handle.