Abstract: A driver circuit for a D.C. motor includes a first output transistor forming an inflow path for a driving current to the stator coil, and a second output transistor forming an outflow path for the driving current from the stator coil. The two output transistors are incorporated in a semiconductor integrated circuit; each output transistor is an n-p-n transistor in order to increase its current density. One current-mirror circuit including a pair of p-n-p transistors is connected to the first output transistor. Another current-mirror circuit including a pair of n-p-n transistors is connected to the second output transistor. To each output transistor a driving control signal is supplied via the respective current-mirror circuit. The result is that the ratio of inflow and outflow currents is determined by the mirror ratio of the current-mirror circuits, thus resulting in minimized ratio fluctuation. Also the mirror ratio can be controlled by the emitter area ratio of the current-mirror circuits.