PURPOSE:To bond the sealed part of a bag body to the bottom surface of the bag body by a method wherein both side surfaces of a packaging film are folded into a triangle shape, and heat-sealing is performed to form a bag body, then an object to be packaged is filled in the bag body, and by the weight of the packaged object, the bottom surface and sealed part of the bag body are pressure bonded, and the sealed part is cooled. CONSTITUTION:A packaging film A is fed out, and both lateral sealing machines 2, 2 are closed. Folding-in pieces 4a, 4a to form a bottom surface of a bag body C1 project and hit both side surfaces A2, A2 of the packaging film A, and fold in the side surfaces A2, A2 into a triangle shape to form a square shaped bottom surface of the bag body. Folding-in pieces 4b, 4b to form an upper part also project and fold in both side surfaces A2, A2 inward. When respective folding in pieces have reached the front end position, both lateral sealing machines 2, 2 heat seal upper and lower two spots. A cutter 3 cuts and separates the upper and lower bag bodies C1, C2. An object to be packaged is filled, and before a sealed part B1 cools off, a rod 8a is projected to advance a bending body 5, and the sealed part B1 is folded into right angle and pressure bonded on the bottom surface of the bag body C1. By the weight of the packaged object, the bottom surface and the sealed part B1 are further pressed. Cooling air is injected from a blow out port 5c to cool the sealed part B1.
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