Vacuum heat insulation material and cold reserving apparatus with the same

A cold reserving apparatus used in a temperature range not more than a normal temperature,

• the cold reserving apparatus comprising an insulating box and an insulating door body, and
• in at least one of the insulating box and the insulating door body, a vacuum heat insulation material being provided between an outer case and an inner case which have a space therebetween filled with rigid resin foam,
• the vacuum heat insulation material comprising at least a core material and a covering material, the covering material covering the core material and being vacuum sealed, wherein
• the covering material is a lamination body including at least two plastic film layers, one of a metal layer and a ceramic-deposited layer, and adhesive layers for joining therebetween, and
• the lamination body has a stress-relieving structure in inner layers thereof, the stress-relieving structure being able to prevent penetration and propagation of breakage in a direction perpendicular to the lamination body.