Damper

A damper comprising:

• a damper body that is cylindrical, the damper body including
• an inner ring and an outer ring that are concentrically located,
• arc springs that are located side by side in a circumferential direction between the inner ring and the outer ring, and
• slits that separate the inner ring, the outer ring, and the arc springs from each other;
• sealers located on both sides of the damper body in an axial direction, respectively, the sealers including sealing surfaces, respectively, the sealing surfaces facing open ends of the slits in the axial direction, with gaps present between the sealing surfaces and the open ends of the slits;
• and
• a viscous fluid that fills the slits and the gaps, wherein
• the arc springs include a first arc spring and a second arc spring that are located side by side in the circumferential direction,
• each of the slits includes:
• an inner slit portion that separates the first arc spring and the inner ring from each other;
• an outer slit portion that separates the second arc spring and the outer ring from each other;
• and
• a connecting portion that connects the inner slit portion and the outer slit portion,
• the connecting portion includes a restrictor that restricts movement of the viscous fluid between the inner slit portion and the outer slit portion, and
• the restrictor includes a hinderer that is located in a slit width of the connecting portion and extends along an extending direction of the connecting portion, and that hinders a flow of the viscous fluid in one of, or both, the circumferential direction and a radial direction.