PURPOSE: To improve the performance of a member to be produced by extending a fitted adherent part to a desired direction and working or setting at the fitted adhered part a means to prevent the fitted adherent part from displacing when the end part is folded.

CONSTITUTION: Cylindrical members W, W are arranged at the void of a folded part 24 at a fitted member 22 to prevent displacement and the fitted part is prevented by the cylindrical member W from displacement to each other because the folded part of another member is fitted to a notch part 26. An oven body 30 is formed when it is fitted and adhered 34 to a tying member 32. In that case, if these cylindrical members W, W are inserted into the voids of the lower folded parts of the main body 30, no slippage occurs in the fitted and adhered state between the oven body 30 and the tying member 32. Accordingly, since the constituted members is checked from displacement on account of the structure of prevention of displacement, a structure formed corresponding to the use is free from deformation and other failure and useful to improvement of performance.