| 摘要 |
[PROBLEM]A sensor can be mounted easily and an insulating distance between the sensor and a receiving blade can be held reliably. [SOLVING MEANS] A through-hole 7 is formed between plug insertion holes 6, 6 , and a sensor 16 which detects a spark discharge occurring between plug blades is disposed internally of the through-hole 7 . An insulating partition wall 13 is disposed between receiving blades 17, 17 in a standing manner, the sensor 16 is accommodated inside the partition wall, and arrangement is performed such that a portion of the sensor faces the through-hole. An outlet case is formed with an intermediate base body 5 provided with a mounting portion of the receiving blade 17 and a partition wall 13 , a main body 3 which holds a circuit board 22 and the intermediate base body 5 , and a cover body 4 which covers a front face of the main body 3.
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