The present invention provides a current mirror circuit of which consistency (ratio) of the input current and output current is more improved. This current mirror circuit comprises input side and output side bi-polar transistors of which bases are commonly connected, an input side MOS transistor of which source is connected to a collector of the input side bi-polar transistor and of which drain and gate are connected to the input terminal, output side MOS transistors of which source is connected to the collectors of the output side bi-polar transistors, of which drain is connected to the output terminals, and of which gate is connected to the gate of the input side MOS transistor, and an MOS transistor for supplying base current of which source is connected to the bases of the input side and output side bi-polar transistors, and of which gate is connected to the gate of the input side MOS transistor.