Abstract: The arch support device is in the form of a removable shoe insert which is a substantially rigid thin unitary member truncated at both ends to fit between the heel and ball of the foot without underlying either one. A central arch portion is supported from a peripheral base means and is cantilevered for positioning above the shoe shank to present a concave support arm in the transverse direction and a convex support arm in the longitudinal direction. The arch support device extends substantially the full breadth of the plantar surface of the foot to be interposed between the midfoot and shoe insole.