Heat treatment furnace

A heat treatment furnace comprising:

• a furnace body comprising an entrance, an exit, and a heat treatment space in which a plurality of objects is heat-treated;
• a plurality of movable members on which stacks of objects stacked in an up-down direction are aligned at intervals in a left-right direction perpendicular to the up-down direction, the plurality of movable members being aligned in a front-rear direction;
• a pusher configured to push the plurality of movable members forward from the entrance of the furnace body to the exit of the furnace body;
• and
• a plurality of gas supplying pipes each comprising a gas supplying opening through which furnace atmosphere gas is supplied into the heat treatment space, the gas supplying pipes being aligned in the left-right direction,
• wherein
• each of the movable members is positioned between a corresponding pair of the gas supplying pipes adjacent in the left-right direction,
• the gas supplying openings of the gas supplying pipes are arranged so as to supply the furnace atmosphere gas to the stacks of objects,
• the heat treatment furnace includes a plurality of gas exhausting openings through which the furnace atmosphere gas in the heat treatment space is exhausted to outside of the furnace body, and
• as the furnace body is viewed in the front-rear direction, the gas exhausting openings are positioned directly above the intervals between the stacks of objects aligned in the left-right direction on the movable members.