Plug body of the container

To provide a stopper of a container capable of improving the airtightness and liquid tightness. A is attached to the opening 33 of the container body 24, closing the first fitting portion 26 cylindrical to fit into the opening space 25 of the opening 33, one end portion of the first fitting portion 26 the end wall from parts 27 and the other end portion of the first fitting portion 26 and the first divided piece 29 having a first flange portion 28 extending radially outward, and fitted into the first fitting portion 26 of the first split piece 29 by a second divided piece 33 having a second flange portion 32 extending radially outwardly from the second fitting portion 31 and the second fitting portion 31 to form a closed space 30 between the end wall 27 Te, to configure the plug 20. .FIELD 1