Abstract: A folding chair having a friction damping part for decelerating a rotary speed of a seat board is provided. The folding chair comprises the seat board vertically rotatably supported between a pair of stand frames, a rotary connection part connecting the seat board to the pair of stand frames to be vertically rotatable while having a rotary shaft line as a center of rotation, and a damping part capable of decelerating a rotary speed of the seat board. The damping part comprises a friction clutch disposed on the rotary shaft line and having a friction surface arranged in a direction perpendicular to the rotary shaft line, a clutch pressure plate integrally rotating with the seat board and having a pressure surface configured to come in contact with the friction surface of the friction clutch, and an elastic pressure body elastically pressing the clutch pressure plate toward the friction clutch.