| 摘要 |
Reinforcement members 30, 40, 50 are provided within the main frame 201 of a front side frame 2. The reinforcement member 30 is provided with partition walls 31b, 32d, 32e for partitioning a primary closed cross-section C_m of the main frame 201 into a plurality of secondary closed cross-sections c. The first to third partition walls 31b, 32d, 32e are provided with: compression-side ridge lines 31s, 32s, 32u facing each other vertically and coming into contact with each other when the front side frame 2 is deformed; and tension-side ridge lines 31t, 32t, 32v facing each other vertically and coming into contact with each other when the front side frame 2 is deformed. |
