A semiconductor device and a power conversion device

In the semiconductor device for driving a power semiconductor device to minimize dead time when turning on and off the switching elements of the upper and lower arms, to reduce the loss of the power converter. The semiconductor device is used in a power converter having a second switching element first source to the switching element and a second power supply voltage having a drain connected to the first power supply voltage is connected, the drives the first switching element 1 comprising a drive circuit, a second driving circuit for driving the second switching element, a first level shift circuit, a second level shift circuit. The first driving circuit is connected to the source potential of the first switching element and the third power supply voltage of only a high potential a predetermined potential as reference, and the source potential of the first switching element, the. The second drive circuit is connected to the second power supply voltage and the fourth power source voltage and a second power supply voltage only high potential predetermined potential as reference, the. Power potential inputted to the first level shift circuit and the second level shift circuit is a third power voltage and a second power supply voltage.