A reference current generating circuit has: first and second current mirror circuits and first and second output terminals. The first current mirror circuit has: a first transistor of a first polarity being an input-side transistor; and a first resistor connected between a gate of the first transistor and a power supply terminal. The second current mirror circuit has a second transistor of a second polarity being an input-side transistor. An output node of the first current mirror circuit is connected to an input node of the second current mirror circuit, and an input node of the first current mirror circuit is connected to an output node of the second current mirror circuit. A control voltage applied to the gate of the first transistor is output from the first output terminal. A control voltage applied to a gate of the second transistor is output from the second output terminal.