Image forming apparatus with a transfer device

An image forming apparatus configured to form an image on a recording material, the image forming apparatus comprising:

• a base substrate;
• an apparatus main body;
• a drawer unit including (i) a first cartridge, (ii) a support member to which the first cartridge is detachably attached, (iii) a first photosensitive drum disposed on the support member or the first cartridge, and (iv) a first developing roller disposed on the support member or the first cartridge, wherein the drawer unit is configured to be moved to a first inner position inside the apparatus main body and to a first outer position outside the apparatus main body;
• and
• a transfer device including a belt, wherein the transfer device is configured to be moved to a second inner position inside the apparatus main body and to a second outer position outside the apparatus main body, and the belt is configured to contact the first photosensitive drum with the transfer device at the second inner position, and
• wherein the transfer device is configured to be moved from the second inner position to the second outer position when the drawer unit is moved from the first inner position to the first outer position.