A multipole plug comprising: a center pin comprising a head and a shaft portion, the center pin corresponding to a pole; a first terminal strip having an annular ring portion to be fitted onto the shaft portion and a curved plate portion connected at one end thereof to an end portion of said ring portion and disposed along the shaft portion, the first terminal strip corresponding to a further pole; a second terminal strip having an annular ring portion to be fitted onto the shaft portion and a curved plate portion connected at one end thereof to an end portion of said ring portion and disposed along the shaft portion at a side of the shaft portion opposite to the side where the first curved plate portion is disposed, the second terminal strip corresponding to a still further pole; a sleeve disposed outside the first terminal strip and the second terminal strip, the sleeve corresponding to a still further pole; and an insulating resin that insulates the respective poles from each other: characterized in that the curved plate portions (15B,17B) comprise flow holes (15D;17D) for allowing flow of the insulating resin therethrough, the sleeve has a notched portion with a radially inwardly extending notch, and further characterized by an annular shaped positioning ring comprising an inner projecting portion fitted into a gap formed between the curved plate portions (15B,17B) of the first and second terminal strips (15, 17), and an outer projecting portion fitted to the notched portion. a center pin comprising a head and a shaft portion, the center pin corresponding to a pole; a first terminal strip having an annular ring portion to be fitted onto the shaft portion and a curved plate portion connected at one end thereof to an end portion of said ring portion and disposed along the shaft portion, the first terminal strip corresponding to a further pole; a second terminal strip having an annular ring portion to be fitted onto the shaft portion and a curved plate portion connected at one end thereof to an end portion of said ring portion and disposed along the shaft portion at a side of the shaft portion opposite to the side where the first curved plate portion is disposed, the second terminal strip corresponding to a still further pole; a sleeve disposed outside the first terminal strip and the second terminal strip, the sleeve corresponding to a still further pole; and an insulating resin that insulates the respective poles from each other: characterized in that the curved plate portions (15B,17B) comprise flow holes (15D;17D) for allowing flow of the insulating resin therethrough, the sleeve has a notched portion with a radially inwardly extending notch, and further characterized by an annular shaped positioning ring comprising an inner projecting portion fitted into a gap formed between the curved plate portions (15B,17B) of the first and second terminal strips (15, 17), and an outer projecting portion fitted to the notched portion. characterized in that the curved plate portions (15B,17B) comprise flow holes (15D;17D) for allowing flow of the insulating resin therethrough, the sleeve has a notched portion with a radially inwardly extending notch, and further characterized by an annular shaped positioning ring comprising an inner projecting portion fitted into a gap formed between the curved plate portions (15B,17B) of the first and second terminal strips (15, 17), and an outer projecting portion fitted to the notched portion.