BUMPER REINFORCEMENT STRUCTURE

A bumper reinforcement structure capable of achieving a weight reduction while still securing required bending strength in a bumper reinforcement structure with closed cross-section structure configured by joining together an inside member and an outside member. A bumper reinforcement 12 is formed with two closed cross-sections CS configured by joining together three top-to-bottom flanges 20U, 20C, 20L of an inner panel 20 to three top-to-bottom flanges 22U, 22C, 22L of an outer panel 22. The flanges 22U, 22C, 22L are disposed in the same front-rear direction position as that of wall portions 22W that configure the closed cross-sections CS.