It is a task of the present invention to provide an apparatus which can be used for surely correcting an ingrown nail within a very short time (30 min to 1 hr) with a very simple operation and without pain. In the present invention, this task has been accomplished by an apparatus comprising: an upstanding push-down member having at its lower end a push-down head a laterally extending, lifting angle maintenance means secured at its middle portion to the push-down member and lifting members (having anchors at their lower ends) extending downwardly from portions of the maintenance means which are opposite relative to the middle portion of the maintenance means at which the push-down member is secured. When the lifting members are placed under tension, the anchors secured to side portions of a nail are lifted to exert a lifting force on the side portions while causing the push-down member to push the middle portion of the nail in its thicknesswise direction.
