A shock mitigation seat 10 including a plurality of individual shock absorbing members 16 resilient to compression from a shock impact, the shock absorbing members 16 being positioned one adjacent another and such that at a certain stage of compression an individual shock absorbing member 16 resiliently deforms and comes into contact with one or more adjacent individual shock absorbing members 16 which thereby increases resistance to further compression.

Disclosed is a vehicle seat (1) comprising a seat cushion (2) and a seat back (4), wherein the seat cushion and the seat back are comprised of: a frame structure (8) to be fixed to the vehicle body; and a seating member (10) supported by the frame structure having an elastic deformation property and a vibration damping property and allow an occupant to be seated therein, and wherein the vehicle seat satisfies the following relationship: D.sub.S/D.sub.F≥20, where D.sub.S denotes a deformation amount of the seating member itself in a situation where a load W is applied at a position X.sub.S of the seating member, and D.sub.F denotes a displacement of a position X.sub.F of the frame structure corresponding to the position X.sub.S, in a situation where the frame structure is fixed to the vehicle body, and the given load W is applied at the position X.sub.F.

A vehicle seat includes: left and right side frames disposed left and right separately from each other; a first support member disposed between the left and right side frames to support an occupant; and left and right second support members joined to left and right sides of the first support member and having left and right outer sides supported by the side frames to support the occupant in conjunction with the first support member. The first support member is a plate-shaped member, and has left and right ischial region through holes formed in positions corresponding to ischial bones of the occupant. The second support members are located at least partially within front and rear limits defined by an expanse of the ischial region through holes.

A seatback and/or a seat cushion has left and right side frames arranged spaced apart in a left-right direction, and wire laid between the left and right side frames. The wire extends substantially in parallel to the side frames. A pad is placed on the side frames and the wire. The pad includes a first pad layer on the side of a seating surface, and a second pad layer on a side of the pad opposite to the seating surface. The second pad layer is harder than the first pad layer. The second lad layer is supported while being in contact with the side frames and the wire.

A sensor disposition structure in a seat includes a cushion pad and a board-like member which is disposed under the cushion pad. A concave is formed in an upper surface of the board-like member, and a sensor is disposed in the concave.

A mechanism for suspending a skin material on a seat rear surface with a simple and light structure is described. A vehicle seat including a seat back forming a backrest surface includes a seat back pad which is a cushion material of the seat back, a skin material which covers the seat back pad, a wire of which a part is embedded inside the seat back pad and another part is exposed to a seat rear surface, and a hook which is attached to an end portion of the skin material on the side of the seat rear surface. The wire engages with the hook so that the skin material is suspended and fixed to the seat rear surface of the seat back.

A sensor disposition structure in a seat includes a cushion pad and a board-like member which is disposed under the cushion pad. A concave is formed in an upper surface of the board-like member, and a sensor is disposed in the concave.

By promoting air circulation, heat and humidity are reduced more efficiently. A vehicle seat ventilation mechanism includes: a body case which is provided in a cushioning material of at least one of a seat cushion and a seat back and whose interior is an air circulation space; a fan disposed in the body case; and an exhaust port which is provided at a position apart from the fan and discharges an air stream created by air suction by the fan. The air stream enhances the comfort of a microclimate condition on a vehicle seat side which is a rear side of a contact surface, and with this microclimate condition, a thermal environment on a seat occupant side having an increased causal factor of discomfort is replaced, thereby making it possible to enhance the comfort of the clothing microclimate.

A first pressure-sensitive switch group of a seating sensor includes first pressure-sensitive switches (SW11 to SW13) and second pressure-sensitive switches (SW21 to SW23) located on one side of a seat in a left-right direction from the first pressure-sensitive switches, and includes a first pressure-sensitive switch pair including the first pressure-sensitive switch (SW11) and the second pressure-sensitive switch (SW21), and the first pressure-sensitive switch (SW13) and the second pressure-sensitive switch (SW22) located between the first pressure-sensitive switch (SW11) and the second pressure-sensitive switch (SW21), a second pressure-sensitive switch pair including the first pressure-sensitive switch (SW12) and the second pressure-sensitive switch (SW22), and a third pressure-sensitive switch pair including the first pressure-sensitive switch (SW13) and the second pressure-sensitive switch (SW23), in which seating is detected when both the first pressure-sensitive switch and the second pressure-sensitive switch in at least one of the first to third pressure-sensitive switch pairs are turned on.

A seat back (20) includes an upper thoracic support section (20a) for supporting at least a portion corresponding to a lower part of the upper thoracic spine of a seated occupant, and a lower thoracic support section (20b) disposed on a front side with respect to the upper thoracic support section (20a) and configured to support a portion corresponding to the lower thoracic spine of the seated occupant. The lower thoracic support section (20b) is configured to displace backward greatly, as compared with the upper thoracic support section (20a) in such, a way that the upper thoracic spine of the seated occupant is inclined forward, when backward inertia force acts on the seated occupant.