A spring connector, includes: an electrically conductive metal tube, having a bottomed hole; a plunger, which is provided in the bottomed hole so as to freely move in an axial direction and so as not to slip out from the bottomed hole, and an tip end portion of which is protruded from the bottomed hole; and a spring coil, provided in the bottomed hole, and elastically urging the plunger in a protruding direction. The electrically conductive metal tube includes a small diameter tube part having a smaller outer diameter at a distal end side thereof from which the plunger protrudes, and a soldering part being larger than the small diameter tube part in width in a direction perpendicular to the axial direction, at a backward side of the small diameter tube part in the axial direction, and a face of a distal end side of the small diameter tube part is separated from the soldering part in the direction perpendicular to the axial direction.