Triangular left and right load transmission members each have a first arm interconnecting a front sub frame and a left or right rear frame, a second arm interconnecting the front sub frame and a left or right side sill, and a third arm interconnecting the left or right side sill and the left or right rear frame. The transmission members each transmit an impact load from the front sub frame to the left or right rear frame via the first arm and to the left or right side sill via the second arm. A cross member spans between the side sills and fixedly connected to the rear frames. Left and right rigid areas are formed by the transmission members, cross member and right rear frames.