Abstract: A terminal fitting has a conductive portion formed into a cylinder shape and provided with a cut opening on its own side portion and along an axial direction. The conductive portion is further provided with heater pushing portions formed across the axis and in a direction joining the opening and the opposite side, as viewed in the axial direction, so as to push a heater inserted therein, onto the inner wall face of the hollow portion of an element. The left and right side end portions across the cut opening in the terminal fitting are formed into continuous corrugations of a ridge and a recess, and are made generally transversely symmetric across the opening.