To recycle two components attached to a mounting boss solidly to each other, certainly and simply without disposing any of them by conducting the separation of the boss simply.

The two components are made to be a pocket 1 having a flange 1a whereon the mounting boss part 5 is formed protrusively and a door trim 2 as the other component having a mounting hole 6, and an enlarging crush part 7 is formed so as to lie on the door trim 1 side by tightening the forefront of the mounting boss part 5 in a state that the boss 5 is fitted in the mounting hole 6, while a bulged mounting part 9 having internally a cavity 9a is formed at a position between the crush part 7 and a door trim 21, and arranged so that the door trim 2 is attached to the pocket 1 so that the door trim 2 is inhibited from coming off by means of the bulged mounting part 9, and the pocket 1 and the door trim 2 can be separated by breaking the bulged mounting part 9.