To provide an electric window device for a bathroom capable of easily opening/closing a window not only from the inside of the bathroom but also from the outside of the bathroom and eliminating the possibility of electrical shock.

This electric window device for the bathroom comprises the openable window 3 formed in the bathroom 1, an electric power part 4 opening/closing the window 3, a bathroom inside operation part 5 installed in the bathroom 1 to operate the electric power part 4, and a bathroom outside operation part 6 installed on the outside of the bathroom to operate the electric power part 4. A power supply conversion part 21 converting a commercial power supply to a dc low voltage power supply is installed in the bathroom outside operation part 6 so that the dc low voltage power supply can be supplied from the bathroom outside operation part 6 to the bathroom inside operation part 5 and the electric power part 4.