A terminal component comprising: a first metal; a second metal overlapped on the first metal, wherein the first metal and the second metal are made of dissimilar metals; and a boundary between the first metal and the second metal, wherein: the boundary includes: a press-fit portion in which one of the first metal and the second metal is press-fitted to the other one; a joined portion disposed at a location different from the press-fit portion, in which the first metal and the second metal are overlapped and joined together, wherein the joined portion is an ultrasonic welded or resistance welded portion; and characterized in that the boundary further includes a gap formed around the joined portion, wherein the gap is present continuously around the joined portion, wherein the first metal includes a shaft portion and a flange portion extending radially outward from one end of the shaft portion; the second metal exhibits malleability and lower rigidity than the first metal; the second metal is overlapped on an end of the first metal including the flange portion and is press-fitted to a peripheral edge of the flange portion; and the first metal includes a first protrusion disposed at an end thereof including the flange portion, the first protrusion protruding toward the second metal; and the second metal includes a second protrusion disposed at a location in which the second metal is overlapped on the end of the first metal including the flange portion, the second protrusion protruding toward the first metal and being joined to the first protrusion. a first metal; a second metal overlapped on the first metal, wherein the first metal and the second metal are made of dissimilar metals; and a boundary between the first metal and the second metal, wherein: the boundary includes: a press-fit portion in which one of the first metal and the second metal is press-fitted to the other one; a joined portion disposed at a location different from the press-fit portion, in which the first metal and the second metal are overlapped and joined together, wherein the joined portion is an ultrasonic welded or resistance welded portion; and characterized in that the boundary further includes a gap formed around the joined portion, wherein the gap is present continuously around the joined portion, wherein the first metal includes a shaft portion and a flange portion extending radially outward from one end of the shaft portion; the second metal exhibits malleability and lower rigidity than the first metal; the second metal is overlapped on an end of the first metal including the flange portion and is press-fitted to a peripheral edge of the flange portion; and the first metal includes a first protrusion disposed at an end thereof including the flange portion, the first protrusion protruding toward the second metal; and the second metal includes a second protrusion disposed at a location in which the second metal is overlapped on the end of the first metal including the flange portion, the second protrusion protruding toward the first metal and being joined to the first protrusion. the boundary includes: a press-fit portion in which one of the first metal and the second metal is press-fitted to the other one; a joined portion disposed at a location different from the press-fit portion, in which the first metal and the second metal are overlapped and joined together, wherein the joined portion is an ultrasonic welded or resistance welded portion; and a press-fit portion in which one of the first metal and the second metal is press-fitted to the other one; a joined portion disposed at a location different from the press-fit portion, in which the first metal and the second metal are overlapped and joined together, wherein the joined portion is an ultrasonic welded or resistance welded portion; and characterized in that the boundary further includes a gap formed around the joined portion, wherein the gap is present continuously around the joined portion, wherein the first metal includes a shaft portion and a flange portion extending radially outward from one end of the shaft portion; the second metal exhibits malleability and lower rigidity than the first metal; the second metal is overlapped on an end of the first metal including the flange portion and is press-fitted to a peripheral edge of the flange portion; and the first metal includes a first protrusion disposed at an end thereof including the flange portion, the first protrusion protruding toward the second metal; and the second metal includes a second protrusion disposed at a location in which the second metal is overlapped on the end of the first metal including the flange portion, the second protrusion protruding toward the first metal and being joined to the first protrusion.