An ingrown nail corrector (A, A', A", A′′′, 100) which is configured to be attached to a tip of a free edge of a nail to correct an ingrown nail, the ingrown nail corrector (A, A', A", A′′′, 100) comprising a corrective body, a support tube, and a clamping portion, wherein: the corrective body is formed to have a length in a longitudinal direction to be equal to or larger than a nail width of the free edge, using a material having elasticity in which a repulsive force is generated against a force in a direction of flexure, the support tube has an axis parallel to the longitudinal direction of the corrective body, the corrective body is inserted in a freely slidable manner with the longitudinal direction of the corrective body parallel to an axis of the support tube, and the clamping portion includes: a fixing plate having one end protruding to be fixed to the support tube with a width direction parallel to the axis of the support tube, a support plate which is disposed to face the fixing plate while being spaced apart in a thickness direction of the fixing plate with the width direction thereof parallel to the axis of the support tube, an insertion port secured between the fixing plate and an end portion of the support plate on the support tube side, and being for insertion of the tip the free edge of the nail thereinto, and a connecting portion which connects the fixing plate and the support plate at a protruding side end portion of the fixing plate, and has elasticity in which a repulsive force is generated against a force in a direction in which the support plate separates from the fixing plate with expansion of the insertion port. the corrective body is formed to have a length in a longitudinal direction to be equal to or larger than a nail width of the free edge, using a material having elasticity in which a repulsive force is generated against a force in a direction of flexure, the support tube has an axis parallel to the longitudinal direction of the corrective body, the corrective body is inserted in a freely slidable manner with the longitudinal direction of the corrective body parallel to an axis of the support tube, and the clamping portion includes: a fixing plate having one end protruding to be fixed to the support tube with a width direction parallel to the axis of the support tube, a support plate which is disposed to face the fixing plate while being spaced apart in a thickness direction of the fixing plate with the width direction thereof parallel to the axis of the support tube, an insertion port secured between the fixing plate and an end portion of the support plate on the support tube side, and being for insertion of the tip the free edge of the nail thereinto, and a connecting portion which connects the fixing plate and the support plate at a protruding side end portion of the fixing plate, and has elasticity in which a repulsive force is generated against a force in a direction in which the support plate separates from the fixing plate with expansion of the insertion port. a fixing plate having one end protruding to be fixed to the support tube with a width direction parallel to the axis of the support tube, a support plate which is disposed to face the fixing plate while being spaced apart in a thickness direction of the fixing plate with the width direction thereof parallel to the axis of the support tube, an insertion port secured between the fixing plate and an end portion of the support plate on the support tube side, and being for insertion of the tip the free edge of the nail thereinto, and a connecting portion which connects the fixing plate and the support plate at a protruding side end portion of the fixing plate, and has elasticity in which a repulsive force is generated against a force in a direction in which the support plate separates from the fixing plate with expansion of the insertion port.