Provided is a constant current drive circuit that can improve accuracy of a stop timing of quick charge and prevent an overshoot, an insufficient quick charge, and the like from occurring. The constant current drive circuit includes a resistor R5 connected between the output side of the gm amplifier 6 and the input side of the transistor M1. The comparator 9 serving as a charge stopping circuit includes a voltage Vof, and stops charging by the quick charge circuit 8 based on a comparison result of the voltage Vof and the voltage Vs2 generated in the resistor R5.