To provide a two terminal regeneration circuit which can sufficiently regenerate counter electromotive currents and the circuit of which can be simplified.

In this two terminal regeneration circuit 20, counter electromotive currents generated in a DC motor 11 are detected with a comparator 21, and a regeneration FET 22 connected in parallel with the DC motor 11 is turned on with the comparator 21 so that counter electromotive currents can be regenerated. In the two terminal regeneration circuit 20, the positive and negative pole terminals of the comparator 21 are respectively connected to the positive and negative pole terminal of the DC motor 11, and a rectifying diode 25 and a smoothing capacitor 26 are serially connected between the positive and negative pole terminals of the DC motor 11. Charges are stored in the smoothing capacitor 26 when the DC motor is driven so that the stored changes can be used as the power source of the comparator 21.