<p>A high temperature operating element includes a porous high temperature operating element film with low film density formed into a predetermined configuration on one surface of an insulating member with good heat conductivity, a resistive film with a high fusion point and good heat conductivity whose film density is higher than that of the high temperature operating element film, formed into a predetermined configuration on the other surface of the insulating member with good heat conductivity, a lead wire connected to the resistive film, an insulating protective film formed on the insulating member so as to cover the resistive film.</p>
