A synthetic resin cup container including two members: a cup body having a cylindrical shape and a bottom disposed at a lower end of a round peripheral sidewall of this cup body, and a flange unit including a fitting cylinder and a brim-like flange, an inner edge portion of the flange being integrally connected to an upper end of the fitting cylinder, wherein the flange unit is detachably fitted in an upper portion of the cup body by fitting the fitting cylinder in an upper portion of the peripheral sidewall.