To provide a folding chair having a sufficient dimension for allowing a user to retain a posture, reducing a burden on the user, safely operated, having a good appearance when stored, and suitably manufactured at low cost.

This folding chair is characterized in that a seat board, a front board, a back board and a connecting board are formed into an approximately parallel link; a torsional coil spring is provided in the both or either one of a rotating shaft A rotationally connecting the front board to the connecting board and/or a rotating shaft B rotationally connecting the back board to the connecting board; and the rotating shaft is disposed so as to pass through the inside of the torsional coil spring.