Electric power steering apparatus

An electric power steering apparatus comprising:

• a motor for generating auxiliary torque corresponding to steering torque exerted by a driver of a vehicle;
• and
• a control unit for controlling the motor,
• wherein the motor and the control unit are integrated with each other and the motor is mounted in the vehicle through the intermediary of a gear unit,
• wherein the motor has a motor housing in which motor constituent members are contained, one axis-direction end portion of which is sealed, and the other axis-direction end portion of which is opened,
• wherein the control unit has a control unit case in which control apparatus constituent members are contained, one axis-direction end portion of which is opened, and the other axis-direction end portion of which is sealed,
• wherein the other axis-direction end portion of the motor housing and the one axis-direction end portion of the control unit case are coupled with each other while maintaining a waterproofing function,
• wherein the one axis-direction end portion of the motor housing and the gear unit are coupled with each other while maintaining a waterproofing function, and
• wherein the motor housing has a first respiratory apparatus that performs a respiratory action, based on an inner pressure change in the motor housing, the first respiratory apparatus being provided on the one axis-direction end portion of the motor housing.