A semiconductor device includes a comparator which includes two input terminals and compares the voltage values between the power supply voltage which is inputted to one side input terminal and the reference voltage which is inputted to the other side input terminal. A resistor element connects two signal lines that are connected to the input terminals of the comparator One end of a capacitance element is connected to a power supply terminal for applying a power supply and the other end is connected to one input terminal of the comparator.