Image forming apparatus

An image forming apparatus comprising:

• a first unit including an image bearing member capable of rotating while bearing a toner image;
• a second unit including a development member which supplies toner to the image bearing member to develop the toner image;
• an apparatus main body to which the first unit is detachably attached in a direction intersecting with a rotation axis of the image bearing member, the apparatus main body including an opening portion through which the first unit passes when the first unit is to be attached to or detached from the apparatus main body, an opening-closing member which can be moved to open or close the opening portion, a first portion which is in contact with a part of the first unit to position the first unit with respect to the apparatus main body, and a second portion, which does not move together with the opening-closing member, arranged on an opposite side of the first portion with respect to the image bearing member in the intersecting direction;
• and
• a sandwiched unit configured to be movable between a first position at which the sandwiched unit is sandwiched between the first unit and the second portion to press the first unit against the first portion and a second position at which the sandwiched unit is not sandwiched between the first unit and the second portion,
• wherein, when the sandwiched unit is located at the first position, a part of the first unit is urged and brought into contact with the first portion by the sandwiched unit.