| 摘要 |
PURPOSE: To avoid an increase in the weight of a frame and the cost and to improve a footing property by protruding reinforcing ribs abuttable with the vehicle body frame on one side inner face of a step floor on the side where a radiator is arranged, and arranging the radiator on the inner side than one side outer face of the step floor. CONSTITUTION: A radiator 69 is arranged on the right side of an engine E, and the radiator 69 and its cover 74 are arranged on the inner side than the right side outer face of a step floor 140 to guard the radiator 69 when a vehicle is tumbled to the right side. A plurality of reinforcing ribs 154 are integrally provided on the right side rear inner face of an undercover 141c constituting the step floor 140 along with an upper cover 141b to abut with the right side face of the rear frame 12 of a vehicle body frame F. The reinforcing ribs 154 may not abut with the rear frame 12 in the normal state, but the reinforcing ribs 154 prevent the cover 74 from being grounded when the step floor 140 is grounded and warped to abut with the rear frame 12 after the vehicle body is tumbled to the right side.
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