To provide a double cap which achieves diversification of an appearance shape, a raw material and an identifying property of the cap, which can be discriminated when discarded and in which an outer cap can be replaced corresponding to breakage, deterioration and the change of consumer taste, by allowing an inner cap and the outer cap to be separated freely with a simple and secure locking structure.SOLUTION: An engagement groove 122 is constituted by: a vertical groove portion 122a for protrusion guide for guiding an engagement protrusion so as to pull out an outer cap 120 from an inner cap; a vertical groove portion for stopping rotation for relatively stopping the rotation of the inner cap and the outer cap 120; and a horizontal groove portion 122b for protrusion guide communicating with the vertical groove portion 122a for protrusion guide and the vertical groove portion 122c for stopping rotation and...

You do not currently have access to this content.