Abstract: A gas tank is protected by absorbing collision energy with the rear of a vehicle. Rear-side tank frame supports the tank at a position below a rear side member. The front portion of the tank frame is secured on rear side member, while the rear portion is directly or indirectly secured thereto. A torsion beam is arranged ahead of the tank frame. When an input load is exerted at rear end portions of the rear side member and tank frame toward the front of the vehicle, rear side member is folded to a V shape, upward with respect to the vehicle body. The tank frame collides with the torsion beam, and the front portion of the tank frame is pushed upward along with rear side member.

Abstract: A gas tank is protected by absorbing collision energy with the entirety of a rear portion of a vehicle without using a reinforcement member. This reduces weight and cost. Rear-side tank frame supports the tank at a position below rear side member. The front portion of rear-side tank frame is secured on rear side member, while the rear portion is directly or indirectly secured on rear side member. A torsion beam is arranged ahead of rear-side tank frame with respect to the vehicle body. When an input load is exerted at a rear end portion of the rear side member and a rear end portion of rear-side tank frame toward the front of the vehicle, rear side member is folded to a V-shape, upward with respect to the vehicle body. Rear-side tank frame collides with torsion beam, and the front portion of rear-side tank frame is pushed upward along with rear side member with respect to the vehicle body.