An evacuated insulation unit and a method of manufacturing the same. A zeolite adsorbent is degassed in a vacuum stete. The degassed zeolite adsorbent is sealingly packed in a gas impermeable bag in an atmosphere of an adsorption- prod gas. Then, the gas impermeable bag is provided with a communication hole. After the communication hole is provided, the gas impermeable bag is placed into a plastic bag so as to communicate to the plastic bag through the communication hole. A heat insulating material and activated carbon are also placed into the plastic bag. The plastic bag which contains the gas impermeable bag, the heat insulating material and the activated carbon is evacuated immediately after the provision of the communication hole to the gas impermeable bag so that air is prevented from entering the gas impermeable bag. The plastic bag is sealed during evacuation thereof to thereby produce the evacuated insulation unit.