A cartridge includes a receiving recessed portion, a contact portion and a main assembly electrical contact. In a state in which the cartridge is mounted at an image forming position of the main assembly, the cartridge includes a first positioning projection held in the receiving recessed portion; a second positioning projection, provided at a position different from a position of the first positioning projection, contacting the contact portion; and an information storing member including a storing element for storing information and a storing element contact electrically connected with the storing element, wherein the storing element contact contacts the main assembly electrical contact. Moment, about the first positioning projection, applied to the cartridge by a force applied from the main assembly electrical contact to the storing element contact acts in a direction of urging the second positioning projection to the contact portion.