Abstract: A double container includes an inner container and an outer container, has a mouth portion, a body portion and a bottom portion disposed in this order from top to bottom along a direction of a bottle axis, and includes an outside air introduction hole. The bottom wall portion of the bottom portion includes a ground contact portion and a recessed portion. A peripheral wall portion of the depressed portion extends inward in a radial direction as it goes upward. A plurality of ridge portions protruding radially inward are provided on the peripheral wall portion of the depressed portion at intervals in a circumferential direction. The peripheral wall portion of the depressed portion or the ridge portion extends inward in the radial direction via a step portion as it goes upward.