To prevent deformation and to effectively utilize a function as a rectifying member by adhering a reinforcing member for deformation prevention on one expanded side face of an expanded honeycomb body structure at least concerning a showcase for which the honeycomb body structure is used as the rectifying member of a blowout hole.

Concerning this showcase, cold air is blown out of the blowout hole at the upper part of front face of the case, and an air curtain is formed on the front face of the case. In this case, a lot of thermoplastic films of which surfaces are coated with adhesive agents at prescribed intervals are overlapped, laminated and adhered and afterwards, a honeycomb body structure 12 heating and expanding the laminated body is used as the rectifying member of the blowout hole. Then, reinforcing members 13A and 13B are provided on front and rear faces as both the expanded side faces of the honeycomb body structure 12. Thus, the deformation of the honeycomb body structure is surely prevented. Besides, elastic parts 15 deformable to form hollow parts 16 inside are fitted to the upper and lower parts of rear face of the rear reinforcing member 13B. Thus, it is guaranteed the honeycomb body structure 12 is surely fitted.