Aluminum foil folded in a bellows shape, easy to fix by winding both ends of each trough of bellows around a heating tray for fish-roast of an IH cooker or a fish-roast net of a gas range, easy to adapt to heating trays and fish-roast nets of different sizes, Solution: The aluminum foil is folded in a bellows shape and is capable of storing the long aluminum foil in a minimum volume. An aluminum foil folded in a bellows shape, wherein the folding width of the bellows is 5 mm or more and 50 mm or less, and the number of the bottoms of the bellows is 30 or more, without further folding both ends of each of the bottoms of the bellows. Figure 2

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