To provide a receptacle capable of easily positioning a member exposed from a case, with improved assembling workability.

The receptacle 1 is provided with one or more of insertion plug connection parts, an abnormality detection circuit outputting a signal when the abnormality is detected by a detection signal of an abnormality detection means, and a circuit breaking mechanism part 8 operated by the output signal of the abnormality detection circuit, breaking the power supply to the insertion plug connection part, and formed by housing the above members in a case 3. Several kinds of circuits such as a display circuit displaying abnormality through a display lamp 9 by receiving the output signal of the abnormality detection circuit, a reset circuit stopping warning by the operation of a reset-button 10, a test circuit confirming the operation by operating a test button 11 and generating pseudo-abnormality or the like, are mounted on printed base boards 12, 13, and assembled in the case 3 by engaging them on engaging parts 3d, 3d of the case 3.