To provide a container that can be easily peeled off from a stack and allows the stack to stand upright vertically.SOLUTION: A peripheral wall part 2 of a container 100 includes a first peripheral wall part 21 and a second peripheral part 22, and the second peripheral wall part 22 includes a thick part 8. The peripheral wall part 21 extends from a lowermost end of the peripheral part 2, and the second peripheral wall part 22 is positioned following the first peripheral wall part 21 in a direction of an opening 3, and is tilted to the outside of the container 100 with respect to the first peripheral wall part 21. The thick part 8 inflates and protrudes toward an accommodation space 4 at a position facing the first peripheral wall part 21 of the inner container 100 at the time of stacking.SELECTED DRAWING: Figure 1

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