Image forming apparatus and cartridge

A cartridge detachably mountable to an image forming apparatus, for forming an image on a recording material, including:

• a guiding member for guiding the cartridge to a positioning portion provided in a main assembly of the image forming apparatus;
• a first main assembly contact, a second main assembly contact, a third main assembly contact, and detecting means for detecting presence or absence of the cartridge in the main assembly and a mounted state of the cartridge by being electrically connected with the first, second and third main assembly contacts, said cartridge comprising:
• a portion-to-be-guided for being guided by the guiding member;
• a portion-to-be-positioned for being positioned at the positioning portion;
• a first cartridge contact contactable to the first main assembly contact when said portion-to-be-positioned is mounted partway toward the positioning portion and is positioned in the positioning portion;
• and
• a second cartridge contact contactable to the second main assembly contact during mounting of said portion-to-be-positioned toward the positioning portion and contactable to the third main assembly contact only when said portion-to-be-positioned is positioned at the positioning portion.