To provide a packing method for a dry gas holder seal film and a dry gas holder using the seal film for improving the expanding work of the seal film in mounting the dry gas holder seal film and for preventing the seal film from being damaged during the work.

Fig. 1 (a) is an oblique perspective figure of a seal film 1, whose facing inside faces 2, 2 are mutually superimposed contacting closely in advance, meandered in the longitudinal direction (Y direction) and folded. 3 is the folded end in the width direction (X direction) before folding and 4 is the folded end in the width direction newly formed after folding. Fig. 1 (b) shows a condition where a seal film 1 is rolled in toward the center in the longitudinal direction (Y direction) with each folded end 3, 4 in the width direction (X direction) positioned on the outside in the longitudinal direction of the folded ends 3, 4 in the width direction (X direction) as an axis center. After the completion of rolling, the whole is bound and packed using a string shape member, etc.