An audio plug connector for mating with an audio jack connector, includes a main member of substantially cylindrical shape with a plurality of contacts exposed along an axis direction thereof. A subsidiary member is extended from a portion of an outer peripheral surface of the main member and defines at least one terminal groove at a side surface thereof. The terminal groove extends substantially parallel with the axis direction of the main member. A front end of the terminal groove is hooked into an inside of the subsidiary member to form a fixing cavity. At least one conductive terminal is received in the corresponding terminal groove with a rear end thereof extending out of a rear end of the terminal groove. A front end of the conductive terminal is bent rearward to form a hook portion hooked into the corresponding fixing cavity.