To simplify the work in a setting process for attaching a plug with a check valve or a cap to a container body. A valve seat 3 provided on one end opening side of the pouring cylinder 1 and having a hole capable of communicating with the pouring cylinder 1 opened, a valve member 2 interposed between the one end opening of the pouring cylinder 1 and the valve seat 3 and made of a film material having a valve element 2 a for opening and closing the hole of the valve seat 3, And a valve seat 3 fixed to one end opening of the pouring cylinder 1, wherein the valve body member 2 and the valve seat 3 are fixed to one end opening of the pouring cylinder 1. Figure 1

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