Problem to be solved: To provide a container for a plug-in cap which can be easily removed even if the cap is plugged into a mouth without worrying about the position of the cap relative to the mouth. Solution: A mouth side locking protrusion 13 is swelled in a predetermined length along a circumferential direction of a mouth 11 at a predetermined position on an outer peripheral surface of the mouth 11. The slope part 14 is provided from an upper end 12 a of the flange 12 to one end 13 a in the longitudinal direction of the mouth side locking protrusion 13, and has an inclined surface 14 a inclined upward toward the one end 13 a in the longitudinal direction of the mouth side locking protrusion 13 as separating from the upper end 12 a of the flange 12. The cap-side engaging protrusion 22 is swelled by...

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