a structure of a rotating mechanism for a watch case having a time display section , comprising a case body internally accommodating the time display section and having a lower opening , a back cover fitted into the lower opening of the case body , a retining ring secured to a lower portion of the case body , and a band attaching base engaging with the case body by being clamped between the retaining ring and the case body . the case body is adapted to rotate with respect to the band attaching base .