A vehicle (1) includes first and second rear-floor cross members (4, 5) provided between right and left rear-floor side members (2, 2) in a vehicle body rear part and a pair of right and left rear-floor cross member braces (6, 6) provided therebetween. The second rear-floor cross member is formed by a three-member connected body consisting of right and left extension parts (52, 52) connected to the right and left rear-floor side members and a body part (51) arranged therebetween. The rear-floor cross member braces are connected to the body part (51) of the second rear-floor cross member. Shock energy of a shock load applied to the vehicle body rear part from the rear can be absorbed efficiently while the deformation of a rectangular region surrounded by the first and second rear-floor cross members and the right and left rear-floor cross member braces is restrained.