A unit detachably mountable to a main assembly of an image forming apparatus including an openable member capable of opening and closing a unit mounting and demounting opening includes: a grip portion, provided rotatably about a rotational shaft on a side wall of a frame of the unit, being rotatably moved to a projected position in which the grip portion is projected from the side wall and to a retracted position in which the grip portion is retracted in a longitudinal direction so as to be closer to the side wall than the projected position; and a force receiving portion at which the grip portion located at the projected position receives a force from the openable member when the openable member is closed in a state in which the unit is mounted in the main assembly, the force receiving portion being configured to receive the force for rotating the grip portion from the projected position to the retracted position.