In CMOS processing, there may be a case in which a resistance element, such as a poly-silicon resistance, or the like, may be formed which has negative temperature characteristics. In a constant current circuit using this resistance element, a constant current output less affected by the influence of varying temperature is obtained. To a load-side path of a current mirror circuit, a serial connection circuit and a temperature compensation circuit are arranged in parallel each other. The serial connection circuit includes a transistor Q1, a resistance element R1 and a bipolar transistor Q6 and flows a current I1 having positive temperature characteristics. The temperature compensation circuit includes a transistor Q8 and a resistance element R2 and flows a current I2 having negative temperature characteristics. A constant current output based on the sum current I of the currents I1 and I2 is obtained.