Patent ID: 7498544

Claim:
A firing furnace, connected to an external power supply, for firing a firing subject, the firing furnace comprising: a housing including a firing chamber for accommodating the firing subject; a plurality of heat generation bodies arranged in the housing and generating heat with power supplied from the external power supply to heat the firing subject in the firing chamber; a connection member for electrically connecting the external power supply and each heat generation body; a fixing member attached to the housing and including an insertion hole for receiving the connection member; an insulative member for sealing a space between the insertion hole and the connection member; and a restriction structure, formed of an electrically conductive material, for restricting a flow of gas produced in the housing directed through a gap between the fixing member and the connection member and toward the insulative member, wherein the restriction structure is arranged so that the insulative member is hidden behind the restriction structure when viewed from an inner side of the housing.