To enable not only to eliminate burden to an operator but also to prevent invasion of water, foreign materials or the like into a key switch, improving workability of wiring.
A switch side connector 30 is installed in a switch case 1, the switch 13 for opening/closing a power supply circuit of the key switch A, a monitor switch 14, and a terminal stand 15 are respectively connected to this switch side connector 30 via lead wires 32-39, a device side connector 31 connected to a sheath cable K is joined to the switch side connector 30 in an insertable and removable way, a window part 2 for wiring work of the device side connector 31 is installed at the switch case 1, and this window part 2 is made to be closed by an opening/closing lid body 4 via a seal packing 5.
SASAKI SHUNKICHI
FUKUMOTO TETSUYA
ITO MAMORU
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