Electrophotographic image forming apparatus

An electrophotographic image forming apparatus for forming an image on a recording material in a state that a cartridge is mounted to a mounting portion of a main assembly of the apparatus, said apparatus comprising:

• a first opening, provided in said main assembly of the apparatus, for permitting said cartridge to pass into the main assembly to mount said cartridge to said mounting portion;
• an openable member provided in said main assembly of the apparatus and movable between a close position for closing said first opening and an open position for opening said first opening;
• a second opening, provided in said main assembly of the apparatus, for permitting the recording material to pass into said main assembly of the apparatus to supply the recording material;
• and
• a light blocking member provided in said main assembly of the apparatus to suppress impingement of at least a part of external light having entered said main assembly of the apparatus through said second opening onto an electrophotographic photosensitive drum,
• wherein said light blocking member functions to guide said cartridge toward said mounting portion when said cartridge is mounted to said mounting portion through said first opening which is open by movement of said openable member to the open position.