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.