Vehicle seat

A vehicle seat comprising:

• a seat back that forms a backrest surface,
• wherein
• the seat back includes:
• a seat back frame that forms a skeleton of the seat back;
• a pressure receiving member that is installed on the seat back frame and configured to receive a load of an occupant;
• a seat back pad which has a plurality of regions respectively formed of different materials, wherein the seat back pad is disposed between a skin material of the seat back and the pressure receiving member;
• and
• a boundary portion that is a boundary between the plurality of regions formed of the different materials,
• the seat back pad includes an upper cushion region configured to support an upper portion of an upper body of the occupant, a right cushion region configured to support a right portion of the upper body of the occupant, and a left cushion region configured to support a left portion of the upper body of the occupant, wherein the upper cushion region, the right cushion region and the left cushion region are defined by a first groove portion,
• the seat back pad further includes a lumbar support region configured to support a lumbar spine of the occupant,
• a front end portion and a rear end portion of the boundary portion are disposed at a same position in a seat up and down direction,
• the boundary portion is provided along a seat width direction and is located above the lumbar support region in the seat up and down direction, and
• a second groove portion is provided at a front side of the boundary portion.