To sustain a container body and a cover in a fitted state by providing any one of them with means for holding a spool through engagement with the outer circumferential edge o the flange thereof and then fitting the container body and the cover.

A container body 3 has an outer circumferential protrusion 5 to be fitted in the opening 4a of a cover body 4 and a grip part 6 inflating outward is provided in the center of the outer circumferential protrusion 5 integrally therewith. The container body 3 is provided with engaging parts 7, i.e., means for holding a spool 2 removably. Outer circumferential part of the outer circumferential protrusion 5, i.e., the fitting edge of the container body 3, is fitted through the engaging parts 7 to the opening edge 4a of the cover 4, i.e., the fitting edge part thereof. According to the structure, the container body 3 and the cover 4 can be sustained in a fitted state regardless of aging thereof.