| 摘要 |
PROBLEM TO BE SOLVED: To enable a lid member and a container main body to be engaged with each other while a sealing characteristic is being kept between a flange part and the lid device before and after a seal film is removed from the flange part of the container main body. SOLUTION: An engaging sidewall 21 of a lid device 20 is installed at a flange part of a container main body 10. In the case that a seal film 32 is heat sealed on the flange part 15, the flange part 15 is engaged between a first protrusion 22a and a second protrusion 22b, and an outer circumference 32a of the seal film 32 is held between the flange part 15 and the engaging sidewall 21. In the case that the seal film 32 is peeled from the flange part 15, the flange 15 is engaged between the first protrusion 22a and a circumferential edge plate 23. An inner diameter L2 of the engaging sidewall 21 between the first protrusion 22a and the circumferential edge plate 23 is smaller than an inner diameter L1 of the engaging sidewall 21 between the first protrusion 22a and the circumferential edge plate 23, so that the flange part 15 engaged between the first protrusion 22a and the circumferential edge plate 23 and the engaging side wall 21 are closely contacted with each other to keep a close sealing characteristic therebetween.
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