Seat structure

A seat structure which includes a seat cushion part and a seat back part coupled to each other via a reclining mechanism part, the seat structure comprising:

• a reinforcing structure in a substantially rectangular frame shape provided in an area where the seat cushion part and the seat back part are coupled to each other via the reclining mechanism part, from cushion-part side frames included in a cushion frame of the seat cushion part up to back-part side frames included in a back frame of the seat back part, the reinforcing structure including a pair of rigid members provided in side portions of the area and at least two bridge members arranged at an interval from each other and extending between the pair of rigid members along a left and right direction,
• wherein the at least two bridge members are set within an area not higher than a designed hip point, and are set in such a positional relation that the bridge member disposed more rearward is set at a position higher than the bridge member disposed more forward,
• wherein the reclining mechanism part comprises parts which are provided in pair on left and right, and
• wherein each of the pair of rigid members included in the reinforcing structure is comprised of a joining bracket that has relatively higher rigidity than the cushion-part side frame or the back-part side frame to which the joining bracket is coupled, and the joining bracket is coupled to a rear portion of the cushion-part side frame and a lower portion of the back-part side frame.