To provide a hospital chair which can be used in an inverted manner in an inverse triangle headrest.

At the front part of a base frame obtained by providing a vertically-long rectangular recessed part at the center and providing the insertion hole of a connector at the bottom of the recessed part, a cushion material is covered with a cover body to make a headrest body. A pair of disks 19 and 20 are fixed to a connector at the front end of a headrest supporting arm 2. A rectangular core plate 14 obtained by pressing and biasing a below-mentioned disk in a direction in which the center point of the disk is separated from the spring receiving shaft 17 by a spring 18 fixed to a spring receiving shaft 17, is fitted into the recessed part of the base frame and fixed. A pair of disks are provided across the core plate in the recessed part of the base frame, and a rectangular positioning plate 21 is provided integrally between the pair of disks. The lower end of the positioning plate 21 is fitted into a part into which the upper end or the lower end of the positioning plate continuously formed in the positioning plate reception hole of the core plate 14 is fitted, and the position is kept.