An image forming apparatus is provided, which includes: an image forming unit; a fixing unit having a heating part; a rotary drive unit; a driving force transmission unit including a displacement part displaceable to a transmitting position where rotation of the rotary drive unit is transmitted to the fixing unit and a non-transmitting position where the rotation of the rotary drive unit is not transmitted to the fixing unit; a cover configured to cover the heating part; a lock unit configured to selectively lock the cover; and a link unit configured to link the lock unit with the displacement part so that the lock unit locks the cover when the displacement part is displaced to the transmitting position and unlocks the cover when the displacement part is displaced to the non-transmitting position.