The hair clipper comprises comb-like fixed blade and movable blade each having a plurality of comb-teeth each provided at its both sides with blades, in which the movable blade is reciprocated with respect to the fixed blade in an arrangement direction of the comb-teeth to cut hair, the fixed blade or the movable blade is slid in a projecting direction of the comb-teeth to adjust cutting height, wherein a tip of each comb-tooth of the fixed blade is provided with a guide projection for introducing hair, the guide projection is tapered with an inclination angle which is larger than an inclination angle of the comb-tooth with respect to projecting direction of blades on both sides of the comb-tooth.