To provide a safe container made of a styrene-based resin foam sheet by heat-molding the styrene-based resin foam sheet wherein a sharp edge of a mouth cut part of the container punched with the mouth left may not be in direct contact with lips or the like, while a surface of a seal lid can be prevented from being split at the time of unsealing the lid, that is, injury of the lips or fingers can be prevented and fitness to the lips is good.

A container 10 is formed in a manner that after a container body 11 is molded by heat-molding a styrene-based resin foam sheet, the sheet is cut with a mouth 13 swelling outward around an opening of the container body left, wherein at least an upper face 15 and a cut face 14 of the mouth are covered by a heat-shrinkable film 16.