To provide a receptacle wherein a plug provided with an earth electrode and a plug having an earth wire can be simultaneously used, and also an outward appearance is attractive with small size.

In the front of a housing 1, three-piece set plug edge insert ports 4 are provided in two sets arranged in a lengthwise direction. In an end part in a lengthwise direction of the housing 1, a recess 43 wherein an opening is covered openably/closeably by a door unit 70 is provided. In a bottom part of the recess 43, an earth wire insert port 51, 51 inserting an earth wire is provided. The earth wire inserted from the earth wire insert port 51, in the interior of the housing 1, is interposed between a lock spring 53 and a terminal piece 86, to be contact-conducted to the terminal piece 86. Accordingly, space is decreased as compared with a screw type earth wire connection part, also the earth wire insert port 51, 51 is concealed when the door unit 70 is closed, so as to make the outward appearance also more attractive.