Clutch unit

A clutch unit used for a vehicle seat, the clutch unit comprising:

• an operation lever that is rotatable about a rotation axis;
• an operation member that rotates integrally with the operation lever about the rotation axis;
• an output shaft member that is rotatable about the rotation axis and outputs an operation force input to the operation lever to the vehicle seat;
• an input-side clutch including an input-side inner ring member and an input-side outer ring member into which the output shaft member is inserted, and an input-side transmission member disposed in a wedge-shaped space formed between an outer peripheral surface of the input-side inner ring member and an inner peripheral surface of the input-side outer ring member;
• an output-side clutch that transmits rotational torque of the input-side clutch to the output shaft member and curbs transmission of rotational torque from the output shaft member to the input-side clutch;
• and
• a housing that accommodates the input-side clutch, wherein:
• the input-side outer ring member is a member including a disk-shaped bottom part and an outer ring part extending in a rotation axis direction from an outer edge part of the bottom part;
• a part of the outer ring part of the input-side outer ring member is a thick part projecting outward in a radial direction of the input-side outer ring member;
• and
• a thickness of the thick part in the radial direction is larger than a thickness of a non-thick part in the radial direction, the non-thick part being a part of the outer ring part other than the thick part.