An attachment structure of an electromotor, connected to rear wheels, of a vehicle, includes: a sub frame, to which the electromotor is assembled, provided at a rear portion of the vehicle, and having members extending in a longitudinal direction, and front and rear cross members extending in a width direction of the vehicle, the sub frame having a rectangular shape in a direction perpendicular to the longitudinal and width directions; a receptacle provided at a front of the sub frame; and a rear motor mount provided at a rear of the rear cross member, a position of the rear motor mount being substantially the same as that of the electromotor in the perpendicular direction, the electromotor being provided at an upper side of the rear cross member; and a connection member, to which the electromotor is fixed, being provided at a lower side of the front cross member.