ELECTRICAL CONNECTOR AND ELECTRICAL CONNECTOR PAIR

A plug connector includes a locking member of the plug having extension bases fixed to a second plug housing and cantilever extensions extending from the respective extension bases in the direction of a plugging operation. The cantilever extensions each have an engaged hole to receive corresponding one of protrusions protruded from a receptacle housing. The cantilever extensions are each resilient enough to bend in the protruding direction of the corresponding protrusion. A releasing member allows the protrusions to relatively move in the directions of plugging and unplugging operations. When the releasing member is slid relative to the second plug housing, the releasing member bends the cantilever extensions in the protruding directions of the respective protrusions and thereby release engagement of the protrusions with the engaged holes.