An electric actuator assembly comprising: a brush card assembly provided with a brush card part in which a plurality of terminals is molded through insert injection molding; a motor assembly coupled to the brush card assembly and electrically connected thereto; and a housing provided with a coupling part into which the brush card assembly is inserted, having a circuit board provided with a connector , and having a gear assembly for receiving power from the motor assembly and transmitting the power to outside, the circuit board and the gear assembly being installed inside the housing , wherein terminal holes through which the plurality of terminals passes and a coupling hole into which a part of the brush card part is inserted are separately provided in the coupling part , and wherein the housing comprises: a lower body having a lower space formed therein and in which the circuit board and the gear assembly are seated in the lower space ; an upper body having an upper space formed therein communicating with the coupling hole by being integrally formed with the coupling part , the upper body being coupled to the lower body , wherein in the upper space , a plurality of support ribs protrudes adjacent to the coupling part to support a plurality of contact parts respectively passing through the terminal holes , and wherein the plurality of support ribs protrudes toward the lower body from a lower surface of the upper space , and a receiving slit in close contact with an associated one of the contact parts is formed at a front end of each of the plurality of support ribs. a brush card assembly provided with a brush card part in which a plurality of terminals is molded through insert injection molding; a motor assembly coupled to the brush card assembly and electrically connected thereto; and a housing provided with a coupling part into which the brush card assembly is inserted, having a circuit board provided with a connector , and having a gear assembly for receiving power from the motor assembly and transmitting the power to outside, the circuit board and the gear assembly being installed inside the housing , wherein terminal holes through which the plurality of terminals passes and a coupling hole into which a part of the brush card part is inserted are separately provided in the coupling part , and wherein the housing comprises: a lower body having a lower space formed therein and in which the circuit board and the gear assembly are seated in the lower space ; an upper body having an upper space formed therein communicating with the coupling hole by being integrally formed with the coupling part , the upper body being coupled to the lower body , wherein in the upper space , a plurality of support ribs protrudes adjacent to the coupling part to support a plurality of contact parts respectively passing through the terminal holes , and wherein the plurality of support ribs protrudes toward the lower body from a lower surface of the upper space , and a receiving slit in close contact with an associated one of the contact parts is formed at a front end of each of the plurality of support ribs. a lower body having a lower space formed therein and in which the circuit board and the gear assembly are seated in the lower space ; an upper body having an upper space formed therein communicating with the coupling hole by being integrally formed with the coupling part , the upper body being coupled to the lower body , wherein in the upper space , a plurality of support ribs protrudes adjacent to the coupling part to support a plurality of contact parts respectively passing through the terminal holes , and wherein the plurality of support ribs protrudes toward the lower body from a lower surface of the upper space , and a receiving slit in close contact with an associated one of the contact parts is formed at a front end of each of the plurality of support ribs. <EOS>