| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum container for easily confirming the unauthorized opening of the same from the time a food is kept in the container for storage to the time it is opened again for eating or for cooking. SOLUTION: This vacuum container is provided with a container main body 1 and a cover 2 tightly adhered to the main body 1. The cover 1 has a ventilation hole 3 provided with a valve 4 partially on the cover 2. The valve 4 is made of an elastic body, and is provided with an umbrella shaped sheet part 5 placed on the outside of the cover 2 and an insertion part 6 to be inserted in the hole 3 of the cover being extended downward from roughly the center of the sheet part 5. At the tip end side of the insertion part 6, a tip end part 8 having a larger diameter than that of the hole 3 is provided. Between the tip end part 8 and the sheet part 5, a swinging part 7 which is longer than the thickness of the cover 2 with the hole 3 and which has a diameter smaller than that of the hole 3 is provided. A contact face relative to the cover 2 of the tip end part 8 is formed with a ventilation groove 9. |
