Vacuum heat insulator and method of manufacturing the same

A vacuum heat insulator comprising:

• a core having a thickness to reduce heat transfer in a thickness direction of the core from one surface side of the core to an other surface side of the core,
• wherein the core comprises:
• a first fiber layer including plural short fibers which are formed of glass;
• and
• a second fiber layer including a stacked structure of plural long fibers distributed over an entire plane of the second fiber layer, and plural thickness fiber bundles,
• wherein the plural short fibers of the first fiber layer have crimp properties and are intertwined with each other and layered in the thickness direction of the first fiber layer to form a sheet,
• wherein the stacked structure of the second fiber layer is constructed such that the plural long fibers having straightness which are formed of glass extending in perpendicular direction of the second fiber layer and not intertwined with each other are layered in thickness direction,
• wherein each of the plural thickness fiber bundles extends in the thickness direction of the second fiber layer and binds the plural long fibers,
• wherein the plural thickness fibers are provided at intervals so as to form an integrated sheet by binding the long fibers of the stacked structure,
• wherein the plural long fibers included in the second fiber layer are longer than the plural short fibers included in the first fiber layer, and
• wherein the first fiber layer and the second fiber layer are stacked in contact with each other.