The present invention provides a foldable chair includes a main body including a backrest, a seat, and legs; the backrest and the legs are connected to the seat; the seat includes a seating pad ring and a seating pad; the seating pad is placed on the seating pad ring; two folding parts extending upwards are formed on two sides of the seating pad ring; the folding part is provided with a receiving groove; two supports of the backrest are fixed to the folding parts; one end of the support is inserted into the receiving groove and detaches from the receiving groove when the support is moved; the folding part is provided with an opening, where the opening supports the support when the backrest is folded onto the seating pad. The foldable chair requires no bolt for use and packing, and does not occupy large storage.