A skin stimulator which can be produced through a simple process in which a circular disc of a drum is formed by integrating a metal disc having needles on a circumferential surface thereof with a reinforcing resin material using insert injection molding and layering a plurality of metal discs and retainers, thus increasing productivity and economic efficiency, realizing stable operation and preventing foreign substances from being jammed in the drum, and which is configured such that, when pricking the skin with the needles, the needles do not give severe damage to the skin and can be prevented from being broken, thus being effectively used for a lengthy period of time, and in which each of the needles forms a polygonal cross-section of at least six sides instead of a circular cross section, so that, when pricking the skin with the needles, the contact surface of each needle relative to the skin can be reduced, thus minimizing the pain.