The invention provides a gingiva incising device which can easily incise a gingiva particularly at a tongue side and a lip side of a jawbone formed as a bank shape. A gingiva incising device is structured such as to have a cylinder portion, which is longer than a thickness of a gingiva and has approximately the same diameter as a diameter of a dental implant fixture at a leading end side of a main body portion having a grip portion at a rear end side, and has a cutting blade portion for incising the gingiva formed on a whole periphery of the leading end of the cylinder portion, and the cutting blade portion has a portion which protrudes gradually from a position closest to the grip portion toward a position away from the grip portion.
