To improve input offset voltage, also to avoid the increase of a chip size, and to prevent an increase in costs by replacing an element that affects the input offset voltage of a CMOS type differential amplifier by a bipolar element in a normal CMOS process.

An input element 21 on the side of an inverted input of a differential amplification stage 102 of a CMOS type differential amplifier and an input, element 22 on the side of a non-inverted input are replaced by a PNP transistor rather than instead of a P-channel MOSFET. Input offset of the CMOS type differential amplifier is affected greatly by the elements 21 and 22, and the input offset is improved by replacing the elements 21 and 22 with a bipolar transistor. Consequently, it is possible to provide a CMOS process type differential amplifier which is inexpensive, is mounted on a small device and has small input offset voltage without accompanying the addition of a trimming process and the increase in chip size.