To provide a commodity robbery warning device where the supply of power to a monitor warning device cannot easily be stopped and therefore a state where the monitor warning device does not emit warning is not easily made in the commodity robbery warning device where a commodity installation part is fitted to a commodity and the monitor warning device emits warning in accordance with the fitting state of the commodity installation part to the commodity.

A commodity robbery warning device has a commodity installation part 2 fitted to a commodity, a monitor warning device 11 executing a robbery monitor warning operation in accordance with the fitting state of the commodity installation part 2 to the commodity with supply power from a power source device (battery) 12, an input device 13 for inputting a password and a power supply controller 14 controlling power supply to the monitor warning device 11 from the power source device 12. The power supply controller 14 stops power supply to the monitor warning device 11 from the power source device 12 only when the password matched with a registered password stored in a password storage part 144 is inputted from the input device 13.