A fan motor comprising: a rotating shaft; a stator including a hole in which the rotating shaft is disposed; a rotor disposed outside the stator; a fan coupled to the rotating shaft; and a housing disposed below the fan, wherein: the housing includes a hollow columnar portion protruding upward in a cylindrical shape from a lower surface of the housing and having an inner circumferential surface; the rotating shaft is rotatably inserted into the columnar portion; the columnar portion is disposed inside the stator; the rotating shaft is disposed inside the columnar portion; the stator is coupled to an outer side of the columnar portion; the rotor is coupled to the rotating shaft; the columnar portion includes a first accommodating portion, a second accommodating portion, and a third accommodating portion for accommodating bearings; the third accommodating portion is disposed between the first accommodating portion and the second accommodating portion, the inner circumferential surface is disposed between the third accommodating portion and the first accommodating portion and between the second accommodating portion and the third accommodating portion, respectively, the first accommodating portion and the second accommodating portion have an inner diameter larger than an inner diameter of the inner circumferential surface of the columnar portion, respectively; the third accommodating portion has an inner diameter smaller than a diameter of the inner circumferential surface of the columnar portion; and wherein a boundary between the third accommodating portion and the inner circumferential surface of the columnar portion comprises a chamfered surface. a rotating shaft; a stator including a hole in which the rotating shaft is disposed; a rotor disposed outside the stator; a fan coupled to the rotating shaft; and a housing disposed below the fan, wherein: the housing includes a hollow columnar portion protruding upward in a cylindrical shape from a lower surface of the housing and having an inner circumferential surface; the rotating shaft is rotatably inserted into the columnar portion; the columnar portion is disposed inside the stator; the rotating shaft is disposed inside the columnar portion; the stator is coupled to an outer side of the columnar portion; the rotor is coupled to the rotating shaft; the columnar portion includes a first accommodating portion, a second accommodating portion, and a third accommodating portion for accommodating bearings; the third accommodating portion is disposed between the first accommodating portion and the second accommodating portion, the inner circumferential surface is disposed between the third accommodating portion and the first accommodating portion and between the second accommodating portion and the third accommodating portion, respectively, the first accommodating portion and the second accommodating portion have an inner diameter larger than an inner diameter of the inner circumferential surface of the columnar portion, respectively; the third accommodating portion has an inner diameter smaller than a diameter of the inner circumferential surface of the columnar portion; and wherein a boundary between the third accommodating portion and the inner circumferential surface of the columnar portion comprises a chamfered surface. the housing includes a hollow columnar portion protruding upward in a cylindrical shape from a lower surface of the housing and having an inner circumferential surface; the rotating shaft is rotatably inserted into the columnar portion; the columnar portion is disposed inside the stator; the rotating shaft is disposed inside the columnar portion; the stator is coupled to an outer side of the columnar portion; the rotor is coupled to the rotating shaft; the columnar portion includes a first accommodating portion, a second accommodating portion, and a third accommodating portion for accommodating bearings; the third accommodating portion is disposed between the first accommodating portion and the second accommodating portion, the inner circumferential surface is disposed between the third accommodating portion and the first accommodating portion and between the second accommodating portion and the third accommodating portion, respectively, the first accommodating portion and the second accommodating portion have an inner diameter larger than an inner diameter of the inner circumferential surface of the columnar portion, respectively; the third accommodating portion has an inner diameter smaller than a diameter of the inner circumferential surface of the columnar portion; and wherein a boundary between the third accommodating portion and the inner circumferential surface of the columnar portion comprises a chamfered surface.