An image forming apparatus includes a main assembly having an opening; a supporting member for dismountably supporting a cartridge for forming an image on a recording material, the supporting member being movable between an inside position and an outside position through the opening; an openable member configured to open and close the opening; and a connecting member configured to connect the openable member and the main assembly with each other, the connecting member being provided with a movement regulating portion configured to regulate movement of the supporting member placed in the outside position in a state that the openable member opens the opening.