A power conversion device comprising: a rectifier configured to rectify an input voltage supplied from an AC power supply; a converter unit including a reactor connected to an output end of the rectifier, a backflow prevention element connected in series to the reactor, and a switching element connected between the reactor and the backflow prevention element, the converter unit being configured to boost a DC voltage rectified by the rectifier; a smoothing capacitor configured to smooth a bus voltage outputted from the converter unit; a reactor current detection unit configured to detect a reactor current flowing through the reactor; a bus voltage detection unit configured to detect the bus voltage; a temperature detection unit configured to detect a temperature of the switching element; a converter control unit configured to calculate a switching command value for driving the switching element, on a basis of a target command voltage which is the bus voltage to be targeted, the bus voltage detected by the bus voltage detection unit, and the reactor current detected by the reactor current detection unit; a temperature correction unit configured to correct the temperature of the switching element detected by the temperature detection unit, on a basis of the switching command value calculated by the converter control unit, and characterized in that the power conversion device further comprises a storage unit configured to store a correction table or a correction function showing a relationship between the switching command value and a correction amount of the temperature corrected by the temperature correction unit, wherein the temperature correction unit corrects the temperature of the switching element detected by the temperature detection unit, on a basis of the switching command value and the correction table or the correction function stored in the storage unit wherein a switching command value calculated during actual operation is used as the switching command value, the rectifier, the switching element, and the backflow prevention element are integrated in a module, and the correction table or the correction function is set on a basis of a distance between the temperature detection unit and the switching element within the module. a rectifier configured to rectify an input voltage supplied from an AC power supply; a converter unit including a reactor connected to an output end of the rectifier, a backflow prevention element connected in series to the reactor, and a switching element connected between the reactor and the backflow prevention element, the converter unit being configured to boost a DC voltage rectified by the rectifier; a smoothing capacitor configured to smooth a bus voltage outputted from the converter unit; a reactor current detection unit configured to detect a reactor current flowing through the reactor; a bus voltage detection unit configured to detect the bus voltage; a temperature detection unit configured to detect a temperature of the switching element; a converter control unit configured to calculate a switching command value for driving the switching element, on a basis of a target command voltage which is the bus voltage to be targeted, the bus voltage detected by the bus voltage detection unit, and the reactor current detected by the reactor current detection unit; a temperature correction unit configured to correct the temperature of the switching element detected by the temperature detection unit, on a basis of the switching command value calculated by the converter control unit, and characterized in that the power conversion device further comprises a converter control unit configured to calculate a switching command value for driving the switching element, on a basis of a target command voltage which is the bus voltage to be targeted, the bus voltage detected by the bus voltage detection unit, and the reactor current detected by the reactor current detection unit; a temperature correction unit configured to correct the temperature of the switching element detected by the temperature detection unit, on a basis of the switching command value calculated by the converter control unit, and characterized in that the power conversion device further comprises a storage unit configured to store a correction table or a correction function showing a relationship between the switching command value and a correction amount of the temperature corrected by the temperature correction unit, wherein the temperature correction unit corrects the temperature of the switching element detected by the temperature detection unit, on a basis of the switching command value and the correction table or the correction function stored in the storage unit wherein a switching command value calculated during actual operation is used as the switching command value, the rectifier, the switching element, and the backflow prevention element are integrated in a module, and the correction table or the correction function is set on a basis of a distance between the temperature detection unit and the switching element within the module.