The stair-mounted roller wheel device is a device that is adapted for use with at least one stair. Moreover, the stair-mounted roller wheel device is adapted to be positioned onto a stair tread as well as a riser surface of the at least one stair. The stair-mounted roller wheel device includes a base that rests on the stair tread as well as the riser. A roller member is rotatably engaged at a top, front corner of the base. The roller member is adapted to be parallel with the stair tread and the riser. Ideally, in a situation where a plurality of stairs of a staircase is provided, a plurality of the stair-mounted roller wheel devices would be positioned on each of the plurality of stairs such that the object is adapted to be rolled up or down the staircase.
