A rocker includes a lower wall portion, which is an inclined surface inclined downward toward the inside of a vehicle body, on the lower surface of the rocker, and a floor panel is bonded to the lower wall portion. Accordingly, when an in-plane tensile force is applied to the floor panel the in-plane tensile force is applied not in a direction where the bonding between the rocker and the floor panel is separated but in a direction where the bonding between the rocker and the floor panel is shorn. As a result, it may be possible to improve bonding strength. Further, a corner portion is formed at the end portion of the inclined surface facing the floor panel, and a frictional force is generated at the corner portion between the floor panel and the rocker. Therefore, a load, which is applied to the floor panel, can be distributed to the rocker. Due to these operations, reinforcing members and the like do not need to be provided, and it may be possible to improve the bonding strength between the rocker and the floor panel.