According to one embodiment, a first CMOS inverter receives an input signal corresponding to a first power supply voltage, and is driven by a second power supply voltage which is smaller than the first power supply voltage; a second CMOS inverter is connected to a rear stage of the first CMOS inverter, and is driven by the second power supply voltage; a first driving adjustment circuit adjusts a current driving force of a low level output of the first CMOS inverter; and a second driving adjustment circuit adjusts a current driving force of a low level output of the second CMOS inverter.