A seating support device of a wearable chair includes a femoral link extending in a direction where a femoral region extends and configured to be connected with the femoral region, a crural link extending in a direction where a crural region extends, and configured to be connected with the crural region, and including a housing that is coupled at an upper end thereof to a lower end of the femoral link to be rotatable relative thereto and a sliding part that is slidably coupled to the housing in a direction in which the housing extends, and a limiting device operated in conjunction with a relative rotation between the femoral link and the crural link to allow the sliding part to slide vertically and to prevent sliding between the sliding part and the housing in a state where an angle between the femoral link and the crural link is a seating angle.
