To smoothly progress peeling of an inner container from an outer container in a shoulder.SOLUTION: A double container comprises an inner container 12 which is volume-reduced and deformed with a decrease in stored contents, and an outer container 11 in which the inner container is internally placed. A mouth 13, a shoulder 15, a trunk 16 and a bottom 14 are arranged in this order from upward to downward along a bottle axis O direction. An outside air introduction hole 17 for introducing outside air to between the outer container and the inner container with a decrease in contents is provided. The shoulder is configured by connecting a plurality of surface parts 31 in a circumferential direction via corner parts 32, and the corner parts are formed with first vertical grooves 33 extending in the bottle axis direction when viewed from the outside in the radial direction.SELECTED DRAWING: Figure 1...

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