An image forming apparatus that includes a main body housing formed with an opening, a main body frame coupled to the main body housing, an image forming cartridge mounted to the main body frame via the opening, and a cartridge supporting member which includes a supporting member main body formed integrally with the main body frame, and a supporting part formed in the supporting main body to elastically support the image forming cartridge with respect to the main body frame, so that the image forming cartridge can be mounted to the main body frame as the supporting member main body elastically moves to a cutting part formed in a part of the main body frame adjacent to the supporting member main body when the supporting part is pressed by the image forming cartridge.