HEADREST SUPPORT STRUCTURE

A headrest support structure includes: a metal tubular support bracket (11) configured to be provided in a seatback frame (10); a resin headrest support (12) configured to support a headrest stay (14) and inserted into the support bracket (11); and a spring (23) disposed between the support bracket (11) and the headrest support (12). The headrest support (12) is elastically supported in a swingable manner relative to the support bracket (11) so as to make a headrest (13) function as a dynamic damper. The spring is a metal leaf spring (23) provided integrally with the headrest support (12).