Abstract: A stagelessly folding deck chair comprising a back frame, a seat frame pivotally connected with the back frame, a leg frame pivotally connected with the seat frame, two adjusting armrests each having an adjusting rod, and a support frame, wherein the adjusting rod is pivotally connected with both the leg frame and back frame so that when folding the chair, by means of controlling the adjusting rod, the back frame and leg frame are simultaneously moved to quicken the folding operation.