Vehicle seat comprising a seat base having a capacity of depression e and back support equipped with a reinforcement having a top end at the level of which the back of a seat occupant come into contact with, characterized by the fact that the seat is configured so that the values of the depth p, in mm, of the top end and the sum of the height h, in mm, of the top end and of the depression e, in mm, are located in a zone, called comfort zone, said comfort zone being defined in a plane equipped with an orthonormal reference system whose unit is the mm, by a hexagon whose first top end A has the coordinates (x a; Y a + e) with 12<x a <18 and 185<y a + e<195, the second B (x b; y b + e) with 17<x b <23 and 185<y b + e<195, the third C (x c; Y c + e) with 47<x c <53 and 145<y c + e<155, the forth D (x d; Y d + e) with 27<x d <33 and 115<y d + e<125, the fifth E (x e; Y e + e) with 12<x e <18 and 115<y e + e<125 and the sixth F (x f; Y f + e) with 17<x f <23 and 145<y f +e<155, the depth p being represented in abscissa, the distance h + e being represented in ordinates, the depression e, the depth p and the height h are obtained, for the seat fixed to the floor, the floor being considered as defining the horizontal, according to the following measurement protocol: - seated is a dummy 50th percentile according to the standard NF EN ISO 15537 on the seat so that the bottom of the back of the dummy is positioned against the back support; - a point is identified corresponding to the hip joint of the dummy; - the vertical passing through the point is traced, which sections the surface of the seat base at the level of a point called; - then the tangent to the seat base is traced parallel to the floor and the highest point of the seat base is defined, called point, by the point of intersection of said tangent and the seat base; - the tilt axis of the seat base is defined in relation to the horizontal by means of the line; - the perpendicular to the line is traced, passing through the point and called point is the point of intersection of this perpendicular with the seat base; - from point, a circle (C') is traced with 147mm radius; - the point of origin of the seat is defined, called point 0, as being the intersection, of this circle (C') and the line located on the side of the back support; - then, traced from point 0, is a second circle (C") with 665mm radius or, if the back support is less than 665mm high, a second circle (C") passing through the highest point of the back support - defined as being the tilt axis of the back support in relation to the vertical is the line linking the point O with the point of intersection of the second circle (C") and of the back support; - then traced is the tangent to the back support parallel to the tilt axis of the back support, and defined as being the top end of the reinforcement is the point of intersection of said tangent with the back support; - the height h and the depth p of the top end of said reinforcement is measured in relation to the point 0, origin of the seat, as being, respectively, the distance between the top end and the tilt axis of the seat base parallel to the tilt axis of the back support and the distance between the top end and the tilt axis of the back support; - the depression e on the seat base is measured by applying a force of 50 newton with a disc of 20mm diameter at the level of the point. - seated is a dummy 50th percentile according to the standard NF EN ISO 15537 on the seat so that the bottom of the back of the dummy is positioned against the back support; - a point is identified corresponding to the hip joint of the dummy; - the vertical passing through the point is traced, which sections the surface of the seat base at the level of a point called; - then the tangent to the seat base is traced parallel to the floor and the highest point of the seat base is defined, called point, by the point of intersection of said tangent and the seat base; - the tilt axis of the seat base is defined in relation to the horizontal by means of the line; - the perpendicular to the line is traced, passing through the point and called point is the point of intersection of this perpendicular with the seat base; - from point, a circle (C') is traced with 147mm radius; - the point of origin of the seat is defined, called point 0, as being the intersection, of this circle (C') and the line located on the side of the back support; - then, traced from point 0, is a second circle (C") with 665mm radius or, if the back support is less than 665mm high, a second circle (C") passing through the highest point of the back support - defined as being the tilt axis of the back support in relation to the vertical is the line linking the point O with the point of intersection of the second circle (C") and of the back support; - then traced is the tangent to the back support parallel to the tilt axis of the back support, and defined as being the top end of the reinforcement is the point of intersection of said tangent with the back support; - the height h and the depth p of the top end of said reinforcement is measured in relation to the point 0, origin of the seat, as being, respectively, the distance between the top end and the tilt axis of the seat base parallel to the tilt axis of the back support and the distance between the top end and the tilt axis of the back support; - the depression e on the seat base is measured by applying a force of 50 newton with a disc of 20mm diameter at the level of the point.