Skin stimulation brush

A skin stimulation brush pin, comprising:

• an elongated tubular body having a proximal end portion, wherein the tubular body includes a radially contracted portion on a distal end side of the tubular body;
• a base bottom member made of a metal to allow conduction of electricity from an electric circuit, the base bottom member at the proximal end portion of the elongated tubular body;
• an electrode member connected to an opening of the tubular body on a distal end side thereof and having an exposed distal end, a portion of the electrode member adjacent to a distal tip of the tubular body protruding farther in the radial direction than the opening, the radially contracted portion of the tubular body radially protruding toward the electrode member;
• and
• a metal shaft in a tubular inner portion of the tubular body to couple the base bottom member and the electrode member, the tubular inner portion including an inner surface, the metal shaft separated from the inner surface by an air gap.