Provide a correcting device capable of being placed onto a nail without applying an excessive force to the nail or of being properly applicable for correcting nails having different sizes.The correcting device includes a left arm and a right arm, each having an engageable part disposed on a free end so as to be engageable with a side edge of a nail； and a fulcrum member disposed between the left and right arms and having a lower end serving as an abutting part for contact with the nail. The fulcrum member includes a shaft part combined with the base member so as to be vertically movable with respect to the base member by screw movement, a movable member combined with the shaft part so as to be vertically movable with respect to the shaft part and having the abutting part under the shaft part, and an urging member interposed between the shaft part and the movable member so as to urge the movable member. The abutting part extends in left and right directions and has projections disposed on left and right edges such that the projections are adapted to be abutted against the nail while the abutting part is not abutted against the nail between the left and right projections.
