A tubular-shaped shock absorbing member arranged at a side end portion of a vehicle, includes outer and inner wall portions each extending in a vehicle height direction and a vehicle front-and-rear direction, the inner wall portion being arranged on a center portion side of the vehicle, an upper wall portion connected to upper end portions of the inner and outer wall portions, a lower wall portion connected to lower end portions of the inner and outer wall portions, and a horizontal rib connected to the inner and outer wall portions. A distance between the upper and lower wall portions is decreased as approaching from the inner wall portion side to the outer wall portion side. A thickness of a part of the horizontal rib connected to the outer wall portion, is larger than a thickness of a part of the horizontal rib connected to the inner wall portion.