An image forming apparatus includes a sheet feeding cassette configured to store a recording sheet, a conveyance unit configured to convey the recording sheet stored in the sheet feeding cassette, and an image forming unit configured to form an image on a photo sensitive member, and to transfer the image onto the recording sheet conveyed by the conveyance unit. A power supply unit is configured to convert an alternating current (AC) voltage of a commercial power supply into a direct current (DC) voltage, and is configured to supply the AC voltage and the DC voltage. A first heater heats the sheet feeding cassette, and generates heat with the AC voltage supplied by the commercial power supply, and a second heater heats the photosensitive member of the image forming unit, and generates heat with the DC voltage supplied by the power supply unit.