Provided is a seat frame having an energy absorption section for efficiently concentrating, and deforming to absorb, energy pertaining to a rear collision. The seat frame comprises: a seat cushion frame comprising a pair of side frames comprising a plate member and disposed opposite each other in the left-right direction leaving a gap; and a seat back frame connected to the rear of each of the pair of side frames. At least one side frame of the pair of side frames has an energy absorption section extending anteriorly from a portion of the back end thereof, the energy absorption section comprises a concavity at which a portion of the plate member is recessed facing the opposite side frame or facing the reverse side thereof, and the edge of the concavity is demarcated by: a rear edge that extends between the upper end on the rear end of one side frame and the bottom end on the rear end positioned below the upper end; an upper edge extending from the upper end to the front end of the concavity; and a bottom edge extending to the front end from the bottom end.