A power conversion device according to the present invention is provided with two or more sets of power modules each of which includes a switching element and a switching element control circuit having a third electrode voltage control part and a temperature detection part. The power modules PM1, PM2 are connected in parallel to each other. The switching element control circuit includes a temperature comparison part which calculates an average operation temperature of the switching element, and compares an operation temperature of the corresponding switching element and the average operation temperature. The third electrode voltage control part controls a third electrode voltage based on information including an average operation temperature, an operation temperature of the switching element, and a threshold voltage during operation.