| 摘要 |
PROBLEM TO BE SOLVED: To suppress the positional dispersion of a head pipe part relative to the axial central line by fastening a rear fastening plate part inclined down to the front and superposed on a front fastening plate, which is provided at the front end of a rear frame, to the front fastening plate inclined down to the front, which is provided at the rear end of a front frame. SOLUTION: Rear fastening plates 611, 612 inclined down to the front so as to be superposed on front fastening plate parts 561, 562 at the rear end of a front frame 23 from under are integrally provided respectively on both sides of the front end of a frame part 24a in a rear frame 24. On the projection drawing of a flat head pipe part 25 parallel to the fastening surface of both the fastening plate parts 561, 562, 611, 612, the fastening surface is located in a position relatively adjacent to the head pipe part 25. Therefore, even if an assembling error is caused to shift the position of the head pipe part 25 with an inclination to the axial center of the rear frame 24, the positional displacement of the head pipe part 25 to the axial center line of the rear frame 24 can be relatively suppressed.
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