To provide a heat insulating material package which is excellent in transportation efficiency and loading efficiency and is easily handlable safely.

A group of heat insulating material B is formed of a plurality of insulating material 1, each of which is formed by mixing polyester fiber with a material principally consisting of wool and forming this mixture into a mat shape, in layers. The circumference of the group of insulating material B is covered by means of a sheet type object 2 and a closed space C is formed. Then, a pressure inside of the closed space C is reduced, and the volume of the group of insulating material B can be reduced.