To provide a vapor mist insulation type electric apparatus capable of reducing its installation area by being made compact without deteriorating insulation property nor cooling performances.

A body 2 is accommodated in a container 1, which is filled with a mixed insulating medium 5 and provided with a mist generator 10. The mist generator 10 makes an insulator for turning to mist which can be made liquid when the apparatus is in a use state, into vapor mist. The mixed insulating medium 5 in the container 1 is prepared by mixing dry air or nitrogen gas as a gas insulating medium with the vapor mist of the insulator for turning to mist which is incombustible, inactive, and nonpoisonous, and has a global warming factor of 1.