An opening / closing operation of an opening / closing member is facilitated. An opening / closing mechanism that opens and closes an opening / closing member (6) of a container body (4) that is hermetically sealed by an elastic force of a sealing material (8) having a tube structure, and is a space formed inside the sealing material. A pressure reducing path (6b) for reducing the pressure in (8a) to a negative pressure is provided, and the opening and closing member is opened and closed in a state where the space is depressurized and the space is contracted via the pressure reducing path. [Selection] Figure 2
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