A semiconductor integrated circuit device includes a PMOS output element having a source electrode connected to a power supply terminal and a drain electrode connected to an output voltage terminal from which an output voltage is supplied. A voltage dividing circuit has resistors for dividing the supplied output voltage to produce a divided voltage. A reference voltage circuit generates a reference voltage and has a memory element whose threshold voltage determines the reference voltage. The reference voltage circuit has a regulating input terminal connected to the memory element to change the threshold voltage of the memory element. An error amplifier is supplied with the divided voltage and the reference voltage to generate a voltage that is applied to a gate electrode of the PMOS output element. The voltage is amplified depending on a difference between the divided voltage and the reference voltage.