It is obtained a headrest and a vehicle seat provided therewith, capable of obtaining attenuating effect characteristics with respect to oscillation at two resonant frequencies with a simple configuration. A mass body is supported by an elastically deformable first urethane member configuring part of a headrest pad inside a headrest cover of a vehicle seat. Namely, a dynamic damper is configured including the first urethane member and the mass body. The center of gravity of the mass body is set at a position offset in the seat width direction with respect to the elastic center of the first urethane member.