A cover for a cup holder device for a vehicle includes a cover unit including a body, and a side surface protrusion group formed to be protruded on both side surfaces of the body and provided in plural along the longitudinal direction of the body; and a support unit installed at the bottom surface side of the cover unit to support the load of the cover unit, and having a structure in which a plurality of support members formed in the shape of a slice, respectively, are installed to be spaced apart from each other in the longitudinal direction of the cover unit.