Abstract: A sealed container in which a container body having a ring-like shape and a hollow portion at the center includes opening portions on which a cap member of a similar ring-like shape is attached. The container body is sealed when the annular groove portions of a cap member clamp inner and outer edges of opening portions of the ring-like shaped container body and are secured on inner and outer peripheral surfaces of each of these edges. The can member therefore can be easily attached on the container body so that sealing operation can be effected smoothly and mass-production can be achieved. Also disclosed is a method of manufacturing such a container.