To provide a gel pen enabling a user to apply without soaking a tip of brush into gel in a container, and free from a fear that gel becomes dry during treatment.

A gel pen comprises: a cartridge filled with UV curable gel; a body storing the cartridge; a brush-like pen tip provided on a body edge; and a metallic pipe circulating the UV curable gel from the cartridge to the brush-like pen tip central part. The brush-like pen tip comprises a brush part, and a cylindrical part surrounding the brush part to the middle from the body to the tip. The metallic pipe is arranged so as to position the edge thereof on a body side than an opening of the cylindrical part.