Abstract: A plug includes: a plug frame portion having a cylindrical shape; a header portion for being housed in the plug frame portion; a pair of lock arms supported on the plug frame portion; and a plug shutter for moving back and forth in the inserting/extracting directions. Each of the paired lock arms includes: a body extending toward the receptacle; a hook portion formed on the forward end side of the body; and an action member formed closer to the rearward end side than the hook portion. The plug shutter includes: a cylindrical shutter frame portion; a pair of lever portions; and a pair of projections. When the plug shutter is moved backward of the receptacle by holding the lever portions with the fingers, the projections of the plug shutter push the action members of the lock arms inward to deform the lock arms inward thereby to move the hook portions of the lock arms inward.

Abstract: A receptacle type connector fixed to a side plate of an image forming device body includes a primary inserting and drawing recess which is open upward. A contact holding wall of an opponent plug type connector is inserted into and drawn out from the primary inserting and drawing recess. Even when toner intrudes into the primary inserting and drawing recess which is open, the toner can be discharged from the connector via the through-hole, which is formed in a lower portion of the primary inserting and drawing recess, by lightly tapping the receptacle type connector.