To make a heat shrinkage device for thermally shrinking by heating a top seal part after packing a pillow by a shrink film, simple in structure and simple also in control.SOLUTION: A heat shrinkage device comprises a carrier conveyor 11 for carrying a pillow packing body 3 made by wrapping a packing object 5 by a heat-shrinkable shrink film 4, an endless belt 21 arranged under a carrying surface of its carrier conveyor and rotating along a carrying direction, and hot-blast injectors 19 and 20 for injecting a hot-blast toward the outside from the inside of a belt surface of the endless belt opposed to the carrying surface. The endless belt comprises a mesh part 30 extending in a belt width direction, and a hot-blast injected from the hot-blast injectors is injected toward the carrying surface from the mesh part. The endless belt is rotated by tracking the movement of the pillow packing body, and thermally shrinks top seal parts 6a and 6b provided on a pillow packing body front end or rear end by the hot-blast injected from the mesh part.SELECTED DRAWING: Figure 2
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