A motor comprising: a housing; a stator coupled to the housing; a rotor disposed inside the stator; a shaft coupled to the rotor; wherein the housing protrudes upward from a lower surface thereof in a position where the motor stands vertically, wherein the housing comprises: a bearing pocket portion including an accommodation space of said bearing and a shaft hole; and a bearing and a wave washer disposed inside the bearing pocket portion, wherein said accommodation space is formed by an inner wall of the bearing pocket portion, wherein the shaft hole is formed in a bottom surface of the bearing pocket portion, the shaft being inserted into the shaft hole, wherein the bearing pocket portion includes a stepped portion which protrudes upward along a circumference of the shaft hole and an accommodation groove for trapping material abraded from the motor housing, said accommodation groove being formed between the stepped portion and the inner wall of the bearing pocket portion, wherein the bottom surface of the bearing pocket portion forming the accommodation groove is formed with at least two stepped surfaces in a radial direction, wherein the stepped surfaces include an inner stepped surface closest to the shaft hole, wherein the inner stepped surface is formed in a flat shape to be in contact with the wave washer, wherein the stepped portion includes annular grooves concavely formed in a circumferential direction to be spaced a predetermined distance from each other such that a depth of each of the grooves is equal to a height of the stepped surface, said grooves also extending in a radial direction. a housing; a stator coupled to the housing; a rotor disposed inside the stator; a shaft coupled to the rotor; wherein the housing protrudes upward from a lower surface thereof in a position where the motor stands vertically, wherein the housing comprises: a bearing pocket portion including an accommodation space of said bearing and a shaft hole; and a bearing and a wave washer disposed inside the bearing pocket portion, a bearing pocket portion including an accommodation space of said bearing and a shaft hole; and a bearing and a wave washer disposed inside the bearing pocket portion, wherein said accommodation space is formed by an inner wall of the bearing pocket portion, wherein the shaft hole is formed in a bottom surface of the bearing pocket portion, the shaft being inserted into the shaft hole, wherein the bearing pocket portion includes a stepped portion which protrudes upward along a circumference of the shaft hole and an accommodation groove for trapping material abraded from the motor housing, said accommodation groove being formed between the stepped portion and the inner wall of the bearing pocket portion, wherein the bottom surface of the bearing pocket portion forming the accommodation groove is formed with at least two stepped surfaces in a radial direction, wherein the stepped surfaces include an inner stepped surface closest to the shaft hole, wherein the inner stepped surface is formed in a flat shape to be in contact with the wave washer, wherein the stepped portion includes annular grooves concavely formed in a circumferential direction to be spaced a predetermined distance from each other such that a depth of each of the grooves is equal to a height of the stepped surface, said grooves also extending in a radial direction.