An electrical component support structure comprising: a side sill extending in a vehicle front-rear direction at an outer end portion of a floor panel in a vehicle width direction; a tunnel portion extending in the vehicle front-rear direction at a central portion of the floor panel in the vehicle width direction; an electrical component including a connector portion to which a harness is connected; and a bracket disposed between the side sill and the tunnel portion on an upper surface of the floor panel and supporting the electrical component, characterized in that the bracket includes an installation portion to which the electrical component is installed, and a pair of leg portions (23, 24) supporting the installation portion to be separated from the floor panel toward an upper side, extending in parallel to each other from end portions of the installation portion on a side of the tunnel portion toward the tunnel portion, and each of the pair of leg portions (23, 24) including a fastening portion (23A, 24A) fastened to the floor panel, wherein the connector portion is disposed between the pair of leg portions (23, 24) and between the tunnel portion and the electrical component in a plan view of a vehicle, wherein a hole penetrating the floor panel is provided in a position between the fastening portions (23A, 24A) of the pair of leg portions (23, 24), and wherein the harness connected to the connector portion passes through the hole. a side sill extending in a vehicle front-rear direction at an outer end portion of a floor panel in a vehicle width direction; a tunnel portion extending in the vehicle front-rear direction at a central portion of the floor panel in the vehicle width direction; an electrical component including a connector portion to which a harness is connected; and a bracket disposed between the side sill and the tunnel portion on an upper surface of the floor panel and supporting the electrical component, characterized in that the bracket includes an installation portion to which the electrical component is installed, and a pair of leg portions (23, 24) supporting the installation portion to be separated from the floor panel toward an upper side, extending in parallel to each other from end portions of the installation portion on a side of the tunnel portion toward the tunnel portion, and each of the pair of leg portions (23, 24) including a fastening portion (23A, 24A) fastened to the floor panel, an installation portion to which the electrical component is installed, and a pair of leg portions (23, 24) supporting the installation portion to be separated from the floor panel toward an upper side, extending in parallel to each other from end portions of the installation portion on a side of the tunnel portion toward the tunnel portion, and each of the pair of leg portions (23, 24) including a fastening portion (23A, 24A) fastened to the floor panel, wherein the connector portion is disposed between the pair of leg portions (23, 24) and between the tunnel portion and the electrical component in a plan view of a vehicle, wherein a hole penetrating the floor panel is provided in a position between the fastening portions (23A, 24A) of the pair of leg portions (23, 24), and wherein the harness connected to the connector portion passes through the hole.