Abstract: A rocker conversion unit for a molded, stackable lawn-type chair. The rocker conversion unit has an upwardly curved channel shaped rocker having elongated base means adapted to provide the bottom of said rocker and to contact and rock on lawn or other supporting surface, first and second side means integrally connected to opposite edges of said base means and extending upwardly therefrom along substantially the full length thereof. The channel has a substantially uniform side-to-side width and base-to-shoulder height throughout its length and foot retainers to engage the lateral foot segment of a mold lawn chair in a tight frictional fit that locks the chair leg into the channel and stabilizes the rocker on the chair leg.