Provided is a discharge device equipped with a discharge unit and a shutoff detection unit. The discharge unit is configured so as to discharge a capacitor with a variable discharge current value on the basis of a voltage of a rectification signal obtained by full-wave rectifying an alternating current voltage inputted via an input filter including the capacitor. The shutoff detection unit is configured so as to monitor the voltage of the rectification signal, and detect whether or not a power supply has been shut off on the basis of a change in the voltage when the discharge unit discharges at a specific discharge current value.