A soldering apparatus, comprising: a furnace body; a gasket that is provided to at least a part of the furnace body, and that seals the furnace body, and that is fixed in an attachable/detachable manner to the furnace body; a carry-in port through which boards are carried into the furnace body; and a carry-out port through which boards are carried out from the furnace body, characterized in that the furnace body comprises an upper furnace body and a lower furnace body, the upper furnace body and the lower furnace body being coupled with hinges along one edge such that the upper furnace body can be opened for internal maintenance and the like; a push rivet fixes the gasket to the furnace body, the push rivet includes a rivet body and a pin, the pin includes a head portion and a shaft portion including a tapered part such that a diameter of the shaft portion gradually increases toward a distal end of the pin, the rivet body includes a flange portion and a leg portion including a notch portion on a distal side of the pin extending from the flange portion, the flange portion and the leg portion are formed so as to allow the pin to be inserted thereinto, the gasket includes a first sealing portion, a fixation portion coupled to the first sealing portion, a through-hole formed through the fixation portion, and a second sealing portion coupled to the fixation portion, the first sealing portion and the second sealing portion extend along a transport direction of boards, the fixation portion is located between the first sealing portion and the second sealing portion, the push rivet is inserted into the through-hole, the gasket extends along a direction in which the carry-in port and the carry-out port are connected to each other, the gasket is provided along the edge about which the furnace body hinges and along the opposing edge of the furnace body, the fixation portion is thinner than the first sealing portion, and the soldering apparatus comprising a holding plate that is fixed between the gasket and the push rivet by the push rivet while in contact with the fixation portion, in which the holding plate is a long plate that extends in a longitudinal direction of the gasket. a furnace body; a gasket that is provided to at least a part of the furnace body, and that seals the furnace body, and that is fixed in an attachable/detachable manner to the furnace body; that is provided to at least a part of the furnace body, and that seals the furnace body, and that is fixed in an attachable/detachable manner to the furnace body; a carry-in port through which boards are carried into the furnace body; and a carry-out port through which boards are carried out from the furnace body, characterized in that the furnace body comprises an upper furnace body and a lower furnace body, the upper furnace body and the lower furnace body being coupled with hinges along one edge such that the upper furnace body can be opened for internal maintenance and the like; a push rivet fixes the gasket to the furnace body, the push rivet includes a rivet body and a pin, the pin includes a head portion and a shaft portion including a tapered part such that a diameter of the shaft portion gradually increases toward a distal end of the pin, the rivet body includes a flange portion and a leg portion including a notch portion on a distal side of the pin extending from the flange portion, the flange portion and the leg portion are formed so as to allow the pin to be inserted thereinto, the gasket includes a first sealing portion, a fixation portion coupled to the first sealing portion, a through-hole formed through the fixation portion, and a second sealing portion coupled to the fixation portion, the first sealing portion and the second sealing portion extend along a transport direction of boards, the fixation portion is located between the first sealing portion and the second sealing portion, the push rivet is inserted into the through-hole, the gasket extends along a direction in which the carry-in port and the carry-out port are connected to each other, the gasket is provided along the edge about which the furnace body hinges and along the opposing edge of the furnace body, the fixation portion is thinner than the first sealing portion, and the soldering apparatus comprising a holding plate that is fixed between the gasket and the push rivet by the push rivet while in contact with the fixation portion, in which the holding plate is a long plate that extends in a longitudinal direction of the gasket.