To provide a mounting structure of a lever handle, capable of surely fixing a lever handle to an axial body.

In this mounting structure of a lever handle where an axial body 3 is inserted into and locked to a insertion hole 2 installed on the base part of a lever handle 1, a screw body 4 penetrates and screws to the base part of the lever handle 1 so as to project into the insertion hole 2 for pressing the axial body 3 against the internal surface of the insertion hole 2, a fitting part 5 is installed on the internal surface of the insertion hole 2 opposed to the screw body 4, and the axial body 3 is provided with a fitting part 6 of the axial body to be fitted to the fitting part 5 in a mounting state.