Vehicle seat

A vehicle seat having a tilt-down function to sink down a seat cushion in conjunction with farthest tilting motion in which a seat back is tilted down forwardly and having a walk-in function to make a condition in which a seat body is capable of sliding forwardly relative to a vehicle floor in conjunction with half tilting motion in which the seat back is tilted to a forwardly inclined position,

• wherein the seat back is connected to a base member, that is slidably disposed on a vehicle floor, via first and second rotation preventing devices while an intermediate member is interleaved threrebetween, so as to be capable of rotating relative to both of the intermediate member and the base member about a common axis and to be capable of being prevented from rotating relative thereto, and
• wherein a first link integrally connected to the seat cushion is rotatably connected to the intermediate member via a shaft, wherein a second link is disposed between the seat cushion and the base member in order to rotatably connect the same by link coupling, wherein when the tilt-down function is performed, a rotationally-preventing condition of one rotation preventing device connecting the base member and the intermediate member is released, so that the seat back is tiltably rotated forwardly integrally with the intermediate member and that the seat cushion is pushed by the first link capable of moving with the intermediate member so as to be sunk downwardly while tiltably rotating the second link, whereas when the walk-in function is performed, a rotationally-preventing condition of the other rotation preventing device connecting the seat back and the intermediate member is released, so that the seat back can be tiltably rotated to the forwardly inclined position independently of the intermediate member that is maintained in a condition in which the intermediate member is integrated with the base member, further wherein the other rotation preventing device, that is capable of being released when the walk-in function is performed, is disposed on an outside position of the intermediate member in a radial direction thereof, so as to prevent the seat back from rotating relative to the intermediate member when an engagement/disengagement member connected to the seat back enters and engage a depressed portion formed in an outer circumferential peripheral portion of the intermediate member from outside in the radial direction.