Method for fixing steering support, device for fixing steering support, and method for checking deformation of instrument panel reinforcement body

A method for fixing a steering support for supporting a steering column to an instrument panel reinforcement body having a pipe shape, the method comprising the processes of:

• passing the instrument panel reinforcement body through a first through-hole formed in the steering support;
• increasing the pressure inside an area of the instrument panel reinforcement body covered with the steering support, plastically deforming the area of the instrument panel reinforcement body from an inside to an outside, and pressing a circumferential surface of the first through-hole of the steering support by an outer circumferential surface of the area of the instrument panel reinforcement body;
• and
• causing, when the instrument panel reinforcement body is plastically deformed, a part of the instrument panel reinforcement body to bulge in a second through-hole that penetrates the steering support in a thickness direction of the steering support or causing a part of the instrument panel reinforcement body to bulge in such a way that it contacts a thinned part formed on the circumferential surface of the first through-hole of the steering support, thereby causing the instrument panel reinforcement body to bulge and causing the thinned part to be deformed.