Automotive body side structure

An automotive body side structure comprising:

• a side sill extending in a front-rear direction of a vehicle body at a vehicle outer side of the vehicle body in a vehicle width direction and including a side sill inner and a side sill outer joined at an upper end portion and a lower end portion in a vehicle height direction, the side sill inner having a groove shape opening toward vehicle outside in the vehicle width direction and including a top portion and a pair of vertical walls, and the side sill outer having a groove shape opening toward vehicle inside in the vehicle width direction;
• a battery pack disposed at a lower part of the vehicle body vehicle inside in the vehicle width direction relative to the side sill;
• and
• a floor cross member extending in the vehicle width direction above the side sill vehicle inside in the vehicle width direction, wherein
• the floor cross member is made of a metal plate having a tensile strength of 1180 MPa-class or higher, and includes a vehicle outer side end portion in the vehicle width direction not contacting the top portion that is a vehicle inner side face of the side sill inner in the vehicle width direction, the end portion being disposed so as to cover an upper portion of the side sill inner in the vehicle height direction, the end portion extending to and contacting a joining surface portion at the upper end portion of the side sill inner and the side sill outer.