CUSHION SUPPORT MEMBER STRUCTURE AND VEHICLE SEAT

A structure of a cushion support member including reinforcements and a joint at which the reinforcements intersect and are joined together. The reinforcements include a first reinforcement, a second reinforcement and a third reinforcement extending respectively in a first direction, a second direction adjacent to the first direction, and a third direction adjacent to the second direction. The joint has a surface showing a first join line indicating a joined part of the first and second reinforcements and a second join line indicating a joined part of the second and third reinforcements. The first and second join lines are formed of curved lines curving from one side to the other side in a thickness direction of the cushion support member, and an end of the first join line and an end of the second join line meet at a same position on the one side.