An electric heating cushion device includes a heating member in form of a flexible sheet, and including upper and lower dielectric layers and an electric heating film layer disposed therebetween to generate heat when supplied with electric power. Two opposite end portions of the heating member are in a permanent interengagement with each other to roll the heat member into a tubular body, thereby defining a cylindrical space in the tubular body. A cushion member is removably inserted in the cylindrical space. An electric wire unit is connected electrically to the electric heating film layer and an electric power source.