| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner plug which can be easily detached from a mouth portion of a container by a simple operation without forming any breaking line in an annular circumferential wall.SOLUTION: The inner plug 1 includes a top wall 2 having a spout 2a, and an annular circumferential wall 3 hanged from an outer edge of the top wall 2 and surrounding the mouth portion C1 of a container C. A projection 3a extending circumferentially and undercut-engaged with the outer circumferential surface of the mouth portion C1 is provided on the inner circumferential surface of the annular circumferential wall 3. A non-engagement area S1 is provided in the annular circumferential wall 3 by forming the projection 3a in a C-shape discontinuous at a part on the circumference, and a knob member 7 for pulling out the inner plug projects on the outer circumferential surface of the non-engagement area S1 of the annular circumferential wall 2. |
