A deformed nail corrector formed in a band shape and configured to be attached to a nail along a width direction of the nail, comprising: a band-shaped central region configured to be in contact with an upper surface of the nail; and an insertion edge region continuously extended from at least one end of the band-shaped central region and configured to be inserted between a lateral nail edge and a lateral nail fold, wherein in a state that the corrector is attached to the nail, a propeller blade-like portion is formed on a portion including an end portion of the insertion edge region at a base side of the nail and a hook portion of the insertion edge region is formed at a tip side of the nail to hold the lateral nail edge of the nail or a lateral edge of a nail tip, the propeller blade-like portion has a shape curved downward at an angle of 90° or less, in a state that the deformed nail corrector is attached to the nail, an extent of the propeller blade-like portion measured along the width direction of the nail is increased from the base side of the nail to the tip side of the nail and is equal to or more than 5% of a width of the insertion edge region measured along the longitudinal direction of the nail, and the hook portion is curved downward at an angle of 90° or more, wherein, when viewing the deformed nail corrector from the front and assuming a circle having a center point (d) and being formed by extending a curved portion (e-f) of the insertion edge region from a starting point (e) of the curvature to a tip portion (f) of the propeller blade-like portion or the hook portion, the angle is measured between a line (d-e) connecting the center point (d) and the starting point (e), and a line (d-f) connecting the center point (d) and a tip portion (f) of the propeller blade-like portion or the hook portion. a band-shaped central region configured to be in contact with an upper surface of the nail; and an insertion edge region continuously extended from at least one end of the band-shaped central region and configured to be inserted between a lateral nail edge and a lateral nail fold, wherein in a state that the corrector is attached to the nail, a propeller blade-like portion is formed on a portion including an end portion of the insertion edge region at a base side of the nail and a hook portion of the insertion edge region is formed at a tip side of the nail to hold the lateral nail edge of the nail or a lateral edge of a nail tip, the propeller blade-like portion has a shape curved downward at an angle of 90° or less, in a state that the deformed nail corrector is attached to the nail, an extent of the propeller blade-like portion measured along the width direction of the nail is increased from the base side of the nail to the tip side of the nail and is equal to or more than 5% of a width of the insertion edge region measured along the longitudinal direction of the nail, and the hook portion is curved downward at an angle of 90° or more, wherein, when viewing the deformed nail corrector from the front and assuming a circle having a center point (d) and being formed by extending a curved portion (e-f) of the insertion edge region from a starting point (e) of the curvature to a tip portion (f) of the propeller blade-like portion or the hook portion, the angle is measured between a line (d-e) connecting the center point (d) and the starting point (e), and a line (d-f) connecting the center point (d) and a tip portion (f) of the propeller blade-like portion or the hook portion.