An outer-rotor motor comprising: a bearing seat including a chamber, an engagement face, an assembly hole and a shaft hole, wherein the assembly hole and the shaft hole intercommunicate with the chamber; a stator; at least one bearing received in the chamber; and a shaft extending through the shaft hole and the at least one bearing, wherein the bearing seat has a slit (15, 15') which is adjustable, wherein the shaft includes at least one abutment portion, and wherein the at least one bearing abuts the at least one abutment portion, wherein the outer-rotor motor further comprising a rotor engaged with the engagement face, wherein the rotor includes a housing accommodating the stator, the outer-rotor motor further comprising a cover coupled with the bearing seat, wherein the at least one bearing includes a first bearing relatively distant to the cover and a second bearing relatively adjacent to the cover, wherein each of the first and second bearings includes an inner race and an outer race and a plurality of balls, and wherein an elastic member is disposed between the cover and the outer race of the second bearing, wherein the bearing seat has a horizontal through-hole (16, 16') extending through the slit (15, 15'), wherein a positioning member extends through the horizontal through-hole (16, 16') to adjust the slit (15, 15'), wherein the horizontal through-hole is radially aligned with one of the at least one bearing, wherein the positioning member is configured to be loosened for the elastic member to adjust the pressure the outer race exerts on the inner race, and the outer race is misaligned with the inner race to permit the balls to firmly connect to the inner race and the outer race, and the positioning member is configured to be tightened up to permit the bearing seat to properly clamp the at least one bearing. a bearing seat including a chamber, an engagement face, an assembly hole and a shaft hole, wherein the assembly hole and the shaft hole intercommunicate with the chamber; a stator; at least one bearing received in the chamber; and a shaft extending through the shaft hole and the at least one bearing, wherein the bearing seat has a slit (15, 15') which is adjustable, wherein the shaft includes at least one abutment portion, and wherein the at least one bearing abuts the at least one abutment portion, wherein the outer-rotor motor further comprising a rotor engaged with the engagement face, wherein the rotor includes a housing accommodating the stator, the outer-rotor motor further comprising a cover coupled with the bearing seat, wherein the at least one bearing includes a first bearing relatively distant to the cover and a second bearing relatively adjacent to the cover, wherein each of the first and second bearings includes an inner race and an outer race and a plurality of balls, and wherein an elastic member is disposed between the cover and the outer race of the second bearing, wherein the bearing seat has a horizontal through-hole (16, 16') extending through the slit (15, 15'), wherein a positioning member extends through the horizontal through-hole (16, 16') to adjust the slit (15, 15'), wherein the horizontal through-hole is radially aligned with one of the at least one bearing, wherein the positioning member is configured to be loosened for the elastic member to adjust the pressure the outer race exerts on the inner race, and the outer race is misaligned with the inner race to permit the balls to firmly connect to the inner race and the outer race, and the positioning member is configured to be tightened up to permit the bearing seat to properly clamp the at least one bearing.