An object of the invention is to provide a heating device that is securely held in its worn position, and that can exhibit a sufficient heating effect.A heating device comprising:a heat-generating portion having an exothermic composition enclosed in one or more sections, the exothermic composition generating heat by contact with air andan elastic band portion(1) the band portion surrounding all or a portion of the heat-generating portion to keep the heat-generating portion in contact with the body(2) the band portion being connected to an end of the heat-generating portion(3) a face of the heat-generating portion that is brought into contact with the band portion having a moisture permeability of 340 to 610 g/m2 per day, as measured according to Method A (Humidity Sensor Method) defined in JIS K7129 and(4) the band portion having an air permeability of 3 s/300 cc to 61 s/300 cc, as measured according to JIS P 8117-1998: “Paper and board—Determination of air permeance and air resistance: Gurley method”.
