To provide a front wheel supporting structure of a saddle-type vehicle in which slit processing for split fastening causes a cost increase, fastening a front fork from the direction orthogonal to the axis is performed to suppress interference with the other part, and workability is reduced, capable of reducing the processing costs, and enhancing workability in fastening by eliminating the slit, and also improving appearance.

A holder 12 of a top bridge 10 includes only a holder hole 11, but does not includes the slit. A tapered collar 30 having a small diameter part 31 and a tapered part 32 is inserted into the holder hole 11, the upper end of the front fork 1 is inserted through the inside, and the small diameter part 31 is fastened by the tapered collar 30 so that the tapered collar 30 is pulled upward, the tapered part 32 is cut into between the holder 12 and the front fork 1, and the holder 12 and the front fork 1 are tightly fixed by wedge action.