Abstract: An articulated stair walker for traversing staircases including a frame with first and second side sections. Each side section includes a vertical front leg, a vertical rear leg, a horizontal upper tie bar and a horizontal lower tie bar. Each tie bar is pivotally coupled to a front and rear leg of a side section. The side sections are coupled together by an upper and a lower cross bar rigidly affixed between the vertical front legs. Further provided is a lock pin being slidably coupled to each of the side sections and operated by a lever in an L-shaped configuration. One quadrant cam with a plurality of slots is coupled to each of the lower horizontal tie bars. Associated therewith is a lock pin movably coupled to one of the sections and positionable within a slot of the quadrant cam. By this structure, the user may lift the lock pin upwardly to allow the rear legs to be moved downward relative to the front legs.