A wire accommodating protector includes a protector body and a lid for covering the protector body. Lock lugs are provided on outer peripheral edges of the lid and protrude toward the protector body in a manner that allows the lock lugs to flex. Each of the lock lugs has a lock projection provided thereon. Lock lug insertion holes are formed in sidewalls of the protector body, the lock lug insertion holes extend within and down the full height of the sidewalls and are open at top surfaces of the sidewalls. Each of the lock lug insertion holes has a lock protrusion formed therein. The lid is adapted to interlock with the protector body when the plurality of lock lugs are inserted into the respective plurality of lock lug insertion holes so as to engage the lock projections with the lock protrusions.