Image forming apparatus

An image forming apparatus comprising:

• a detachable unit including a driven member configured to rotate;
• and
• an apparatus body to which the detachable unit is detachably attached,
• wherein the apparatus body includes:
• a driving-force transmission portion configured to transmit driving force to the driven member, and including an engagement member, the engagement member being configured to rotate about a rotation axis extending in an axis direction and to engage with the driven member;
• a support portion configured to support the driving-force transmission portion so that the driving-force transmission portion is rotatable, and including an extending surface extending in an intersecting direction that intersects the axis direction;
• a brake portion configured to generate brake force that applies load to rotation of the driven member;
• and
• a brake-force applying portion including a through member extending from one side of the extending surface to the other side of the extending surface in the axis direction, and a brake engagement member configured to engage with the driven member, the brake-force applying portion being configured to apply the brake force to the driven member via the through member and the brake engagement member by the brake engagement member engaging with the driven member, and
• wherein the brake portion is disposed opposite the driving-force transmission portion across the extending surface in the axis direction.