An object of the invention is to provide a heating device that can warm the body to promote blood circulation, while restricting the movement of an area of the body to which the heating device is applied.A heating device attached to a body, comprising:a heat generating portion having an exothermic composition enclosed in one or more sections, the exothermic composition generating heat by contact with air andat least one band portion formed of an extensible material and attached to the heat-generating portionthe exothermic composition accommodated in each section having a weight per unit area of 0.11 to 0.94 g/cm2 andeach section having an area of 15 to 150 cm2.
