An image forming apparatus includes, an image forming unit, an irradiating unit, a first low voltage power supply which generates a first low voltage, a first low voltage power supply line, a first switching element, a first high voltage generating unit including a first transformer, a second low voltage power supply, and a control unit. The image forming apparatus further includes a cover which can be opened and closed, wherein the image forming unit detects the opening and closing of the cover; and an interlock switch which interlocks with the opening/closing of the cover and includes a first contact point connected to the first low voltage power supply and a second contact point connected to the first low voltage power supply line, wherein the interlock switch is opened to disconnect the first contact point from the second contact point when the cover is opened.