PROBLEM TO BE SOLVED: To achieve high stiffness of a seat frame.;SOLUTION: At a top surface 26A of a body frame 21 of a vehicle body frame 11, a first seat frame connection part 41 and a second seat frame connection part 42 are provided on the left front side and right front side, and a third seat frame connection part 43 is provided backward and downward thereof and therebetween in the horizontal direction. In a seat frame structure 51, a left upper seat frame 52 extends backward from the first seat frame connection part 41, a right upper seat frame 53 extends backward from the second seat frame connection part 42, a left lower seat frame 54 connects between the third seat frame connection part 43 and a rear end of the left upper seat frame 52, a right lower seat frame 55 connects between the third seat frame connection part 43 and a rear end of the right upper seat frame 53, and a bridge 56 connects the left upper seat frame 52 and each rear end of the right upper seat frame 53.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2019,JPO&INPIT
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