Vehicle seat

A vehicle seat comprising:

• a panel frame that is formed in a panel shape and constitutes a framework of a seatback, and of which a first supported portion, a second supported portion and a third supported portion are supported at a vehicle body,
• the first supported portion being provided at one width direction end side of a lower portion side of the panel frame,
• the second supported portion being provided at the other width direction end side of the lower portion side, and
• the third supported portion being provided at one width direction end side of an upper portion side of the panel frame;
• and
• a reinforcement member that is formed in a closed cross-section shape and includes an open cross-section member with an open cross-section shape and a flat plate member with a flat plate shape, which is joined to an open side of the open cross-section member, a peripheral edge portion of the flat plate member protruding to an outer side of a peripheral edge portion of the open cross-section member in a flange shape and the protruding portion being welded to an open side end portion of the open cross-section member, the reinforcement member includes a first reinforcement portion and a second reinforcement portion and the reinforcement member is joined to the panel frame,
• the first reinforcement portion spanning between the first supported portion and a portion at the upper portion side of the panel frame at the width direction other end side relative to the third supported portion, and
• the second reinforcement portion being provided to intersect the first reinforcement portion and spanning between the second supported portion and the third supported portion.