A foldable chair frame and a foldable chair are provided. The foldable chair frame includes a base, having three or more opening grooves; and three or more joint structures, each including a first rotating member and a second rotating member that are coaxially pin-jointed in the opening groove. A stopper that limits a relative rotation angle between the second rotating member and the first rotating member is disposed on the first rotating member. A first abutting part that limits a relative rotation angle between the first rotating member and the base is disposed on the first rotating member; and/or a second abutting part that limits relative rotation angle between the second rotating member and the base is disposed on the second rotating member.