A vehicle seat comprising a seat cushion part and a seat back part, wherein the seat cushion part comprises a cushion frame supporting a seat cushion part cushion member, an energy absorbing structure part is disposed inside left and right side frames (11, 12) constituting the cushion frame, and the energy absorbing structure part is a frame body in a substantially square shape in plan view, the frame body comprising: a pair of left and right stringers supported on upper rails (601, 611) of sliders (600, 610) provided on left and right sides, respectively, and each disposed along a forward and backward direction inside the side frames; and a front beam and a rear beam bridged across front portions and rear portions, respectively, of the pair of stringers (110, 111), belt anchor attaching members (117, 118) are each provided between a coupling position to a vicinity of a rear portion of the upper rails and a coupling position of the rear beam in one of the stringers (110, 111), and the vehicle seat is structured such that a deformation of the stringers (110, 111) accompanying an upward displacement of the belt anchor attaching members (117, 118) by an impact force of a predetermined value or higher absorbs the impact force, the deformation of the stringers forms a truss which couples a disposed position of the belt anchor attaching members, a coupling position of the front beam, and the coupling position to the vicinity of the rear portion of the upper rails, and this truss further resists the impact force at least temporarily wherein the pair of left and right stringers (110, 111) is disposed along the forward and backward direction between the upper rails (601, 611) of the sliders (600, 610) and the side frames (11, 12), characterised in that the vehicle seat has a pair of left and right sub-stringers (1101, 1102, 1111, 1112), disposed inside the respective upper rails of the sliders along the forward and backward direction at positions corresponding to at least vicinities of front portions and vicinities of rear portions of the stringers, and coupled to vicinities of the front portions and vicinities of the rear portions of the upper rails, the front beam and the rear beam are bridged across the front portions and the rear portions, respectively, of the pair of stringers by penetrating through the sub-stringers, and the belt anchor attaching members (117, 118) are each disposed by penetration to form a two-position support structure across one of the stringers and one of the sub-stringers which oppose via one of the upper rails between a coupling position to a vicinity of a rear portion of the upper rails and a coupling position of the rear beam in the sub-stringers. a pair of left and right stringers supported on upper rails (601, 611) of sliders (600, 610) provided on left and right sides, respectively, and each disposed along a forward and backward direction inside the side frames; and a front beam and a rear beam bridged across front portions and rear portions, respectively, of the pair of stringers (110, 111), belt anchor attaching members (117, 118) are each provided between a coupling position to a vicinity of a rear portion of the upper rails and a coupling position of the rear beam in one of the stringers (110, 111), and the vehicle seat is structured such that a deformation of the stringers (110, 111) accompanying an upward displacement of the belt anchor attaching members (117, 118) by an impact force of a predetermined value or higher absorbs the impact force, the deformation of the stringers forms a truss which couples a disposed position of the belt anchor attaching members, a coupling position of the front beam, and the coupling position to the vicinity of the rear portion of the upper rails, and this truss further resists the impact force at least temporarily wherein the pair of left and right stringers (110, 111) is disposed along the forward and backward direction between the upper rails (601, 611) of the sliders (600, 610) and the side frames (11, 12), characterised in that the vehicle seat has a pair of left and right sub-stringers (1101, 1102, 1111, 1112), disposed inside the respective upper rails of the sliders along the forward and backward direction at positions corresponding to at least vicinities of front portions and vicinities of rear portions of the stringers, and coupled to vicinities of the front portions and vicinities of the rear portions of the upper rails, the front beam and the rear beam are bridged across the front portions and the rear portions, respectively, of the pair of stringers by penetrating through the sub-stringers, and the belt anchor attaching members (117, 118) are each disposed by penetration to form a two-position support structure across one of the stringers and one of the sub-stringers which oppose via one of the upper rails between a coupling position to a vicinity of a rear portion of the upper rails and a coupling position of the rear beam in the sub-stringers.