And manufacturing method thereof vacuum heat insulating material, and thermally insulating box including the vacuum thermal insulator

In a vacuum thermal insulating material 5 having a core material 1 enclosed in a gas barrier container 2 whose inside is made to be a decompressed state, the core material 1 has a lamination structure in which a plurality of sheet-shaped long fiber organic fibrous assemblies 10 and 11 are continuously wound up from an inner periphery to an outer periphery. Then, a plurality of sheet-shaped organic fibrous assemblies 10a to 10d and 11a to 11d are arranged in parallel and sheet-shaped multiple organic fibrous assemblies 100 and 110 having joint sections 12 and 13 are formed. The joint sections 12 and 13 are made not to overlap with the upper and lower of joint sections 12 and 13.