A soldering apparatus that solders an electronic component on a circuit board using a solder composition, the apparatus comprising: a soldering unit (12, 14,16) that solders the electronic component on the circuit board; characterized by a detection unit (20, 22) that detects information of consumed electric energy, the information relating to an amount of the consumed electric energy of the soldering unit (12, 14, 16) and consumed electric energy of the detection unit itself; a calculation unit that calculates a total amount of the consumed electric energy of the soldering apparatus; a control unit which is connected and controls the detection unit (20, 22) and the calculation unit and sends a previously set coefficient of consumed electric energy as information on its consumed electric energy to the calculation unit; this coefficient corresponding to an amount of consumed energy of the control unit, as its consumed electric energy is changed within a fixed range and a display unit with a screen that displays on the screen thereof the total amount of the consumed electric energy of the soldering apparatus which is calculated by the calculation unit, and wherein the calculation unit obtains the information of the consumed electric energy of the soldering unit (12, 14, 16), and the consumed electric energy of the detection unit (20, 22) the information being detected by the detection unit (20, 22), obtains the information of the consumed electric energy of the control unit, and calculates the total amount of the consumed electric energy of the soldering apparatus based on the obtained information of the amount of the consumed electric energy of the soldering unit (12, 14, 16) the consumed electric energy of the detection unit (20, 22) and the consumed electric energy of the control unit. a soldering unit (12, 14,16) that solders the electronic component on the circuit board; characterized by a detection unit (20, 22) that detects information of consumed electric energy, the information relating to an amount of the consumed electric energy of the soldering unit (12, 14, 16) and consumed electric energy of the detection unit itself; a calculation unit that calculates a total amount of the consumed electric energy of the soldering apparatus; a control unit which is connected and controls the detection unit (20, 22) and the calculation unit and sends a previously set coefficient of consumed electric energy as information on its consumed electric energy to the calculation unit; this coefficient corresponding to an amount of consumed energy of the control unit, as its consumed electric energy is changed within a fixed range and a display unit with a screen that displays on the screen thereof the total amount of the consumed electric energy of the soldering apparatus which is calculated by the calculation unit, and wherein the calculation unit obtains the information of the consumed electric energy of the soldering unit (12, 14, 16), and the consumed electric energy of the detection unit (20, 22) the information being detected by the detection unit (20, 22), obtains the information of the consumed electric energy of the control unit, and calculates the total amount of the consumed electric energy of the soldering apparatus based on the obtained information of the amount of the consumed electric energy of the soldering unit (12, 14, 16) the consumed electric energy of the detection unit (20, 22) and the consumed electric energy of the control unit.