A walker device includes: a main frame having opposite front and rear ends a backrest rod unit a hand-grip rod unit and at least three rollers, wherein the backrest rod unit is mounted on the rear end of the main frame, the hand-grip rod unit is mounted on the front end of said main frame while each of the three rollers are mounted rotatably to a lower portion of the main frame via a leg unit. The backrest rod unit includes a seat-carrier rod projecting therefrom, a seat mounted on the seat-carrier rod and a slidable backrest provided with a safety belt.
