<p>A motor-operated fan apparatus (F) is made up of a brushless motor (10) and a centrifugal fan (20). The brushless motor (10) has: a rotary shaft (12) vertically disposed on a substrate (11) in a rotatable manner; a stator (13) disposed coaxially with the rotary shaft (12); and a rotor (14) integrally disposed on the rotary shaft (12). The centrifugal fan (20) has: a disk part (21) which covers the brushless motor (10) and is fixed to the rotary shaft (12); and a multiplicity of vane parts (22) which are disposed so as to be elongated from an outer edge of the disk part (21). A ventilation control member (30) is provided in a space between the rotor (14) and the disk part (21) to block the air flowing from the substrate side to the space between the rotor (14) and the disk part (21).</p>
