To simply and easily check whether or not a fire extinguisher is housed and whether or not a door is closed.

A fire hydrant circuit 11 lights a red light display light 26 when fire extinguisher detection switches 56-1, 56-2 detect the fire extinguisher and turns off the red display light 26 when they do not detect fire extinguisher. A transmitter switch 28-3 switched on by pressing operation of a transmitter button is connected to the fire extinguisher detection switches 56-1, 56-2 of the display light circuit in parallel and the red light display light 26 is checked and lighted by switching on the transmitter switch 28-3 by pressing the transmitter button in the state that the fire extinguisher detection switches 56-1, 56-2 are off.

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