In a current driver, a gate of a first generating transistor, gates of K driving transistors, and a gate of a second generating transistor are connected to a gate line in this order. A first differential amplifier outputs a voltage determined according to the difference between a voltage from a first supply node and a voltage at the drain of the first generating transistor. A second differential amplifier outputs a voltage determined according to the difference between a voltage from a second supply node and a voltage at the drain of the second generating transistor. The gate of the first generating transistor receives the output of the first differential amplifier. The gate of the second generating transistor receives the output of the second differential amplifier.