An ion-generating device has a positive electrode pair and a negative electrode pair. The positive electrode pair and the negative electrode pair are disposed in a casing with a space interposed therebetween, such that an induction electrode in the positive electrode pair and an induction electrode in the negative electrode pair are separated from each other. It is thereby possible to obtain an ion-generating device and an electrical apparatus, capable of efficiently emitting both of positive ions and negative ions to an outside of the device, and easily achieving reduction in size and thickness.