A three-pin electrical plug with improved terminal structure includes an earth pin, two terminals and a plug body. The terminal has a blade portion, a joint portion and a wire-gripping portion. The terminal further has a first axis passing through a widthwise center of the blade portion; a second axis being parallel to the first axis and passing through a widthwise center of the joint portion; and a third axis being parallel to both of the first axis and the second axis, and passing through a widthwise center the wire-gripping portion, wherein the third axis coincides with neither the first axis nor the second axis. Thereby, a mold for deforming the wire-gripping portion can have its side walls made thicker so as to extend the service life of the mold. Thus, the improved terminal structure is conductive to mass manufacturing of the plug in terms of both efficiency and cost.