PURPOSE: To prevent an adhering surface of a container from being warped by a method wherein two or more filling members of open cell foamed material are applied in a pressure reduced thermal insulation pack such as a refrigerator, and gettering agent is arranged on the connected surface between the two filling members so as to be crossed with each other.

CONSTITUTION: A pressure reduced thermal insulation pack 6 is constructed such that open cell urethane foams 3a, 3b are stored in a container 7 formed by a laminate film of plastic and metal and then a gettering agent pack 8 of active carbon is arranged to be crossed on their connected surface 5. Then, an adhesion surface 7a of the container 7 is a surface opposite to the storing section of the gettering agent pack 8, although the gettering agent pack 8 is crossed on the connected surface 5 of the open cell foamed members 3a, 3b and when the pressure of the container 7 is reduced, the gettering agent pack 8 is closely contacted with it to increase its strength, resulting in that a degree of flatness can be assured without being influenced by a warping of the filled material.