The rear frame includes an inclined part that is inclined inward in, a vehicle width direction in going rearward and a horizontal part that extends rearward from a rear end of the inclined part. A rear part of the side sill includes a first enlarged width portion that increases in width inwardly in the vehicle width direction via a bent portion. A front part of the rear frame inclined part includes a second enlarged width portion that increases in width outwardly in the vehicle width direction. A rear end of the first enlarged width portion and a front end of the second enlarged width portion are connected. An inner wall in the vehicle width direction of the first enlarged width portion and an inner wall in the vehicle width direction of the inclined part are linearly continuous in plan view.