A bumper reinforcement (10) includes a first member (1), and a second member (2). The first member (1) includes a first flat sheet (11), and two first parts (12). The first parts (12) are respectively connected to two side edges of the first flat sheet (11). The second member (2) includes a second plate (24), two wall parts (22), two flanges (21), and two second parts (23). The wall parts (22) are respectively connected to two side edges of the second plate (24). The flanges (21) are respectively connected to the two wall parts (22). The second parts (23) are respectively connected to side edges of the two flanges (21), and are provided so as to correspond to the first parts (23). The two flanges (21) of the second member (2) are joined with the first flat sheet (11) of the first member (1). The first parts (23) stand up toward the second member (2) side.