To provide a plug cover capable of covering a clearance between a plug holding portion of cord and a socket so as to prevent electrical shock or fire from occurring.

This plug cover is constituted so as to cover a clearance between a blade 3 and a socket 4 during connection of the blade 3 implanted at the plug 2 of a cord 1 and the socket 4. In this case, a rear portion 5 is peripherally attached to the plug 2, a periphery of the blade 3 is surrounded by a peripheral wall 6 provided forwardly thereof, and further a below portion is formed on the peripheral wall 6 to be expandable in the forward and backward direction.