A ventilator (10) includes a casing (20) which includes an inlet (21) for outdoor air, an inlet (22) for indoor air, and an air outlet (23), and an air-blowing fan (30) contained in the casing (20). The ventilator (10) is configured to suck the outdoor air and the indoor air through the corresponding inlets (21, 22) into the casing (20) by using the air-blowing fan (30), process the sucked air, and supply the processed air through the outlet (23) into a room. An electrical dust collecting mechanism (40) is provided in the casing (20) to remove dust in the sucked air. Furthermore, a deodorizing mechanism (50) having a low resistance to air circulation is provided in the casing (20) to remove an odorous substance in the sucked air.
