To provide a nostril hair cutter in which sharpness is hardly lowered by cut nostril hairs.

This nostril hair cutter is provided with both a cylindrical fixed blade 58 which is protruded from a head part 56 freely detachable from a main body case 52 and in which hair guiding grooves 60 along the axis L are circumferentially and parallelly arranged and a movable blade 12 mounted to a base 62 rotation-freely arranged at the mounting section of the head part 56 in the main body case 52 to rotate as sliding over the inner surface of the fixed blade 58 inside the fixed blade 58. The movable blade 12 constituted of a plurality of plate-shaped spring members 12b which are extended from the surface of the base 62 and in which blade parts 12a to slide over the inner circumferential surface of the fixed blade 58 are formed at the tips, and an opening preventing ring 16 to restrict the opening of the blade parts 12a toward the inner circumferential surface of the fixed blade 58 is fitted over the whole of the plurality of plate-shaped spring members 12b.