Abstract: A retort cup includes a tubular barrel portion formed of a barrel portion forming blank having a paper layer and thermoplastic resin layers; and a bottom portion which seals one of the openings of the barrel portion. The bottom portion has a downwardly bent peripheral edge portion. The barrel portion has an attached barrel overlap portion where both end edges of the blank are overlapped with each other and sealed, a lower fold-back portion which is formed at a lower end of the barrel portion by folding back the blank inwardly, and an upper fold-back portion which is formed by folding back the ends of the fold-back blank inwardly. The lower end of the barrel portion, the upper fold-back portion, and the peripheral edge portion of the bottom portion are sealed together. The peripheral edge portion is inserted into the lower fold-back portion.

Abstract: A retort cup including a tubular barrel portion formed of a barrel portion forming blank having a paper layer and thermoplastic resin layers provided on both surfaces of the paper layer. A bottom portion seals one of the openings of the barrel portion and has a downwardly bent peripheral edge portion. The barrel portion has an attached barrel overlap portion where both end edges of the barrel portion forming blank are overlapped with each other and sealed, a lower fold-back portion is formed at a lower end of the barrel portion and an upper fold-back portion is formed by folding back the ends of the fold-back barrel portion forming blank inwardly. The lower end of the barrel portion, the upper fold-back portion, and the peripheral edge portion of the bottom portion are closely sealed together. The peripheral edge portion is inserted into the lower fold-back portion.