An audio plug includes an insulating housing of substantial column shape, a plurality of cylindrical audio contacts made up of a tip contact, a first contact and second contact, a fixing element with two indention areas symmetrically formed at an outer surface thereof and spaced away from each other, and two isolated grounding contacts of arc shape. Each of the grounding contacts has an arc contact slice received in the indention area of the fixing element, conforming to an outer periphery of the fixing element. The tip contact, the first contact, the second contact, and the fixing element with the grounding contacts attached thereto are arranged in turn and molded to the insulating housing in once, forming as a single piece.