The present invention effectively prevents a short circuit from occurring between a power supply terminal and a ground electrode. A receptacle-side connector (3) includes a metal plate (mid-plate 32) and a shell part (23). An edge surface (end surface part 32a) of the metal plate, which edge surface is located at an end surface facing a first side toward an opening (23a) of the shell part (23) and which corresponds to a position of a power supply terminal (Vbus terminal 25), is shaped so as to be set back toward a second side opposite the first side.