To provide a highly rigid floor structure for a vehicle capable of preventing heat transfer from an engine to the interior.
An air duct 4 is arranged in a front floor 1 between a radiator fan 82 installed in the vehicle front part and the engine 3. In the air duct 4, a front edge 41 and a rear edge 43 are higher than a center 42. The front edge 41 is higher than a center 82a of the radiator fan 82. In the rear edge 43, a width-expanded part 44 is arranged for installing a straitening vane 6. The straitening vane 6 is provided with an upward curved main body part 61 and a mounting part 62 having a recessed center 62a. The straitening vane 6 is installed by welding the mounting part 62 to the front floor 1. In the straitening vane 6, a brake pipe 71 and a harness 72 are installed via clamps 73, 74.
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