To provide a fitting jig for easily mounting a connecting metal fitting on the end of a flexible hose.

Press-fitting the press-fit tube shaft part 25 at a connecting metal fitting 23 from the end of a flexible hose 21 forms a state that the end of the flexible hose 21 is sandwiched between the outer boundary of the press-fit tube shaft part 25 and the inner boundary of a reinforcing collar 22. Screwing and advancing a male screw rod 7 for press-fitting the connecting metal fitting 23 gradually presses in the flexible hose 21 in the reinforcing collar 22 set in a grasping part 4 with its press fitting. In addition, advancing a pressing pin 15 presses in the flange 24 of the connecting metal fitting 23 until the flange 24 of the connecting metal fitting 23 is abutted to the end of the hose 21 and the end of the reinforcing collar 22. The result fits the reinforcing collar 22 on the inner boundary of the end of the hose 21, and the connecting metal fitting 23 on the outer boundary.