| 摘要 |
PROBLEM TO BE SOLVED: To provide a double container which can prevent shower water from intruding from an outside air introduction hole in cooling after thermal filling of a content.SOLUTION: A chack valve 30 is provided with a through part 31, a protrusion part 32 connected to one end of the through part 31, an annular groove part 32b formed on the protrusion part 32, and an abutment part 33 connected to an other end side part of the through part 31. In a first mounting position, the annular groove part 32b fits to an outside air introduction hole 14 and seals the outside air introduction hole 14. In a second mounting position, the through part 31 passes through the outside air introduction hole 14 while remaining a clearance as a ventilation passage when squeeze of a body part is released. The abutment part 33 prevents falling of the check valve 30 into an internal space N by abutting on an outer side surface of an outer layer body 10 at least when the squeeze of the body part is released.SELECTED DRAWING: Figure 2 |
