A ventilating apparatus comprising: a ventilating unit having a heat exchanger for making discharge air being discharged from a room to heat exchange with draw-in air being drawn-in from outdoors, an air draw-in fan, and an air discharge fan; a humidifying unit having a water supply tank for holding water, a humidifying member for absorbing water from the water supply tank for the draw-in air to pass therethrough for humidifying the same, and a drain pan for draining the water dropped from the humidifying member, characterized in that at least one of the water supply tank, the humidifying member, and the drain pan has an antibacterial coating applied thereto; and a submerged discharge sterilizing unit provided to the water supply tank to make selective submerged discharge in the water, wherein the submerged discharge sterilizing unit includes at least one discharge cell, the discharge cell including: an insulating substrate, a high voltage electrode portion provided to one side of the insulating substrate, a ground electrode provided to the other side of the insulating substrate, a first insulating layer provided to a surface of the high voltage electrode portion for preventing the high voltage electrode from oxidizing as the high voltage electrode portion is brought in contact with water, and a second insulating layer provided to a surface of the first insulating layer for enhancing an insulating performance of the high voltage electrode, the second insulating layer having pores for forming a plurality of micron bubbles through the pores upon application of a voltage to the high voltage electrode. a ventilating unit having a heat exchanger for making discharge air being discharged from a room to heat exchange with draw-in air being drawn-in from outdoors, an air draw-in fan, and an air discharge fan; a humidifying unit having a water supply tank for holding water, a humidifying member for absorbing water from the water supply tank for the draw-in air to pass therethrough for humidifying the same, and a drain pan for draining the water dropped from the humidifying member, characterized in that at least one of the water supply tank, the humidifying member, and the drain pan has an antibacterial coating applied thereto; and a submerged discharge sterilizing unit provided to the water supply tank to make selective submerged discharge in the water, wherein the submerged discharge sterilizing unit includes at least one discharge cell, the discharge cell including: an insulating substrate, a high voltage electrode portion provided to one side of the insulating substrate, a ground electrode provided to the other side of the insulating substrate, a first insulating layer provided to a surface of the high voltage electrode portion for preventing the high voltage electrode from oxidizing as the high voltage electrode portion is brought in contact with water, and a second insulating layer provided to a surface of the first insulating layer for enhancing an insulating performance of the high voltage electrode, the second insulating layer having pores for forming a plurality of micron bubbles through the pores upon application of a voltage to the high voltage electrode. an insulating substrate, a high voltage electrode portion provided to one side of the insulating substrate, a ground electrode provided to the other side of the insulating substrate, a first insulating layer provided to a surface of the high voltage electrode portion for preventing the high voltage electrode from oxidizing as the high voltage electrode portion is brought in contact with water, and a second insulating layer provided to a surface of the first insulating layer for enhancing an insulating performance of the high voltage electrode, the second insulating layer having pores for forming a plurality of micron bubbles through the pores upon application of a voltage to the high voltage electrode.