Abstract: The hitch mounted jack adapter device provides for removable insertion into an existing receiver hitch. The device receives the jack I-beam of an existing hi-lift jack. The smooth use of the device is provided by the spaced apart first rollers and second rollers that guide the existing jack I-beam through the I-shaped jack notch of the device. The vertically spaced apart first rollers and second rollers further provide defined vertical guidance of the jack I-beam. By negating binding and significantly reducing friction, combined with the gusset disposed between the hitch insert and the riser of the jack receiver, the device further provides for safe operation through strength coupled with frictional reduction. Of importance is that the device provides for easy, uncomplicated use.