The present invention provides a drive control circuit for electric motor and elctric motor equipped with same. It is therefore an object of the present invention to provide a motor control technology capable of adapting flexibly to changes in supply voltage. The drive control circuit (200) includes a driver circuit (250) for intermittently supplying the magnetic coils with a supply voltage VSUP;a switching signal generating circuit (240) that generates a switching signal supplied to the driver circuit (250); and a voltage setter (270) that supplies a supply voltage control value Ya to the switching signal generating circuit (240). By adjusting pulse width of the switching signals DRVA1, DRVA2 with reference to the supply voltage control value Ya, the switching signal generating circuit (240) adjusts the effective voltage which is applied to the magnetic coils.