A cushion structure for a vehicle seat, for location underneath a lower surface of a cushion foam, the cushion structure comprising: a flexible band comprising a plurality of band bodies, which each consist of a flexible material; characterised in that: the cushion structure further comprises: a cushion pan, in which are formed a plurality of band pass holes; and a tension adjusting mechanism for adjusting the tension of the band bodies, wherein the tension adjusting mechanism includes a movement device (51, 52, 53) being connected with a rotation device (54, 55), the movement device being connected to the flexible band; and in that the plurality of band bodies extend in parallel in the longitudinal direction of the seat, through the band pass holes, from the band tension adjusting mechanism to the rear end of the seat; the plurality of flexible band bodies are connected with a plurality of connecting flexible bands which extend in the orthogonal direction to the longitudinal direction of the cushion seat; and the movement device of the tension adjusting mechanism is arranged to carry out a function for movement of the flexible band bodies in the longitudinal direction of the seat, wherein the tension adjusting mechanism carries out a function for adjusting the hardness of the cushion foam by adjusting the tension of the band bodies. a flexible band comprising a plurality of band bodies, which each consist of a flexible material; characterised in that: the cushion structure further comprises: a cushion pan, in which are formed a plurality of band pass holes; and a tension adjusting mechanism for adjusting the tension of the band bodies, wherein the tension adjusting mechanism includes a movement device (51, 52, 53) being connected with a rotation device (54, 55), the movement device being connected to the flexible band; and in that the plurality of band bodies extend in parallel in the longitudinal direction of the seat, through the band pass holes, from the band tension adjusting mechanism to the rear end of the seat; the plurality of flexible band bodies are connected with a plurality of connecting flexible bands which extend in the orthogonal direction to the longitudinal direction of the cushion seat; and the movement device of the tension adjusting mechanism is arranged to carry out a function for movement of the flexible band bodies in the longitudinal direction of the seat, wherein the tension adjusting mechanism carries out a function for adjusting the hardness of the cushion foam by adjusting the tension of the band bodies. the cushion structure further comprises: a cushion pan, in which are formed a plurality of band pass holes; and a tension adjusting mechanism for adjusting the tension of the band bodies, wherein the tension adjusting mechanism includes a movement device (51, 52, 53) being connected with a rotation device (54, 55), the movement device being connected to the flexible band; and in that a cushion pan, in which are formed a plurality of band pass holes; and a tension adjusting mechanism for adjusting the tension of the band bodies, wherein the tension adjusting mechanism includes a movement device (51, 52, 53) being connected with a rotation device (54, 55), the movement device being connected to the flexible band; and in that the plurality of band bodies extend in parallel in the longitudinal direction of the seat, through the band pass holes, from the band tension adjusting mechanism to the rear end of the seat; the plurality of flexible band bodies are connected with a plurality of connecting flexible bands which extend in the orthogonal direction to the longitudinal direction of the cushion seat; and the movement device of the tension adjusting mechanism is arranged to carry out a function for movement of the flexible band bodies in the longitudinal direction of the seat, wherein the tension adjusting mechanism carries out a function for adjusting the hardness of the cushion foam by adjusting the tension of the band bodies.