Abstract: A device for stabilizing and supporting a large cup whose base diameter exceeds the smaller diameter of a support receptacle such as is typically provided in a moving vehicle. The device includes a tubular support base having a diameter slightly smaller than the diameter of a standard can or cup receptacle and having an axial length of at least approximately 1/2 inch. A support plate is coupled at one side to a top rim of the tubular support base, the remaining side of the support plate being attached to a base rim of a truncated support cone having a diameter greater in size than the tubular diameter and being adapted in configuration for receiving the container or cup therein. A cantilevered configuration of the adaptor device imposes retention forces which increase with the increased weight contained in the supported cup.