To facilitate removal of a cover member made of a synthetic resin from an aerosol can made of a metal, and facilitate a sorted-discharge.

For the cover member 30, on both of the front and rear walls of the peripheral wall 31 of the cover member, a cut-off lines 34 and 35, and a thin-walled indented groove 33 are formed. Then, the peripheral wall section surrounded by the cut-off lines and thinner indented groove is formed into a second elastic piece 36. A first elastic piece 14 of an adapter is formed to be separable inward from the internal surface of the cover member peripheral wall 31 when the second elastic piece is elastically deformed inward. Thus, the removal of the cover member from a body section 2 is facilitated.