Vehicle seat

A vehicle seat with a seat cushion and a seatback, the vehicle seat comprising:

• a first side frame constituting a part of a framework of the seat cushion and extending in a seat front-rear direction, the first side frame being arranged at a first end, in a seat-width direction, of the seat cushion;
• a second side frame constituting a part of the framework of the seat cushion and extending in the seat front-rear direction, the second side frame being arranged at a second end, in the seat-width direction, of the seat cushion;
• a first coupling member coupling a front end of the first side frame and a front end of the second side frame to each other, the first coupling member extending in the seat-width direction;
• a second coupling member coupling a rear end of the first side frame and a rear end of the second side frame to each other, the second coupling member extending in the seat-width direction;
• a back frame constituting a framework of the seatback;
• a recliner coupled to a lower end of the back frame, the recliner having a function of switching a rotatable state, in which the back frame is rotatable in seat front-rear directions, and a non-rotatable state;
• a coupling plate to which the recliner is coupled, the coupling plate being fixed to the rear end of the first side frame;
• a first fastener to fix the coupling plate to the first side frame by fastening;
• a second fastener to fix the coupling plate to the first side frame by fastening, the second fastener being arranged in a position displaced toward a seat rear side relative to the first fastener;
• a first reinforcer fixed to a first portion, of the first side frame, located in an extending direction center thereof to thereby reinforce the first portion;
• and
• a second reinforcer fixed to a second portion, of the first side frame, surrounding the second coupling member to thereby reinforce the second portion,
• wherein the first side frame has a low-rigidity portion provided between the first fastener and the second fastener, and
• wherein a thickness, parallel to the seat-width direction, of the low-rigidity portion is smaller than a sum of a thickness, parallel to the seat-width direction, of the first portion and a thickness, parallel to the seat-width direction, of a part of the first reinforcer, the part being fixed to the first portion, and than a sum of a thickness, parallel to the seat-width direction, of the second portion and a thickness, parallel to the seat-width direction, of a part of the second reinforcer, the part being fixed to the second portion.