Image forming apparatus

An image forming apparatus comprising:

• an image bearing member unit detachably mountable to a main assembly of said image forming apparatus, said image bearing member unit includes an image bearing member;
• a developing unit including a developer carrying member configured to form a toner image on said image bearing member, said developing unit detachably mountable to said image forming apparatus;
• an accommodating portion configured to accommodate said image bearing member unit and said developing unit and provided with an inserting opening through which said developing unit is insertable;
• a rotatable openable member configured to open and close said inserting opening;
• a pressing mechanism configured to press and release said image bearing member unit and said developing unit relative to each other in interrelation with an opening and closing operation of said openable member;
• and
• a contact surface provided on said openable member, said contact surface is capable of being contacted by an upstream end portion of one of said units with respect to an inserting direction of said one of said units into said image forming apparatus, when said openable member is closed in a state that the upstream end portion is projected out of said inserting opening by a predetermined amount beyond a predetermined position,
• wherein an angle formed between a normal line of said contact surface and the inserting direction in a downstream side is not less than 90 degrees.