Image forming apparatus

An image forming apparatus comprising:

• an apparatus body including an image bearing member;
• and
• a detachable unit detachably attached to the apparatus body, the detachable unit including
• (i) a transfer roller including a roller shaft configured to rotate around a rotation axis, the transfer roller being configured to form a transfer portion, at which an image is transferred from the image bearing member to a recording material, together with the image bearing member, and
• (ii) a pivoting member including a shaft supporting portion supporting the roller shaft rotatably, the pivoting member being pivotable between a first position and a second position around the rotation axis in a state in which the detachable unit is attached to the apparatus body,
• wherein the apparatus body includes a holding member configured to hold the pivoting member and including a recess recessed in a first direction intersecting the rotation axis,
• wherein in a case where the detachable unit is attached to the apparatus body, the shaft supporting portion is allowed to enter the recess by moving the pivoting member in the first direction while maintaining the pivoting member in a posture corresponding to a posture of the pivoting member when the pivoting member attached to the apparatus body is at the first position,
• wherein the holding member is configured to hold the shaft supporting portion in a state in which the pivoting member attached to the apparatus body is pivoted to the second position and an outer peripheral surface of the shaft supporting portion comes into pressure contact with an inner surface of the recess, and
• wherein a first length is smaller than a second length, the first length being a width of the outer peripheral surface of the shaft supporting portion in a second direction orthogonal to the first direction in a case where the pivoting member at the first position is viewed in a direction of the rotation axis, the second length being a width of the outer peripheral surface in the second direction in a case where the pivoting member at the second position is viewed in the direction of the rotation axis.