Provided is an extraction plug with a liquid draining function that allows residual liquid remaining in the extraction plug to be returned into a container in a short time. An inner fitting cylinder 2 fitted into the mouth P1 of the container P, and a closing plate 3 for closing the inner fitting cylinder 2. The closing plate 3 is provided with a cut-off piece 4 for opening the extraction port 5. A step is formed in which the upper surface of the cut-off piece 4 is lower than the upper surface of the closing plate 3. A curved surface step 6 is provided in which an upper surface corner of the step is formed into a curved surface. A thin-walled breaking part 7 for separating the cut piece 4 is provided. A liquid draining wall 8 protruding downward from the rupture part 7 is formed along the rupture part...

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