An electric power conversion device includes: a first switching element; a second switching element; a control device; a first temperature sensor; a second temperature sensor; a first transmission circuit; and a second transmission circuit, wherein the control device has a storage device, and the control device is configured to: calculate a calculated temperature using a first signal and a correction amount; control the operations of the first switching element and the second switching element based on the calculated temperature; and add the difference between a first comparison temperature and the calculated temperature to the correction amount when the control device determines that a first comparison result changes from lower than the first comparison temperature to equal to or higher than the first comparison temperature, and that the calculated temperature is lower than the first comparison temperature.