<;P>;PROBLEM TO BE SOLVED: To provide a green house having a high rust prevention performance, improved also in durability and weatherability and effectively preventing a film sun burn phenomenon developed in the case of using a house construction material made from aluminum or stainless steel at low cost. <;P>;SOLUTION: This construction material (a film-securing material 1) for constructing the plastic green house H covered with a synthetic resin film F, is characterized by performing powder coating on the surface of a metal member (an aluminum member 2) formed as a prescribed form. <;P>;COPYRIGHT: (C)2009,JPO&INPIT