Abstract: A pen-holding corrective apparatus is formed with at least a plurality of poisitioning parts for positioning the thumb, the middle finger and the index finger of a user, so as to combine points of force exertion for the thumb, the middle finger and the index finger via the positioning parts and enable the ring finger and the little finger to curl behind the middle finger, so that the user can master a correct pen-holding posture with the pen-holding corrective-apparatus, whereby the user's fingers can curl naturally without touching the palm when the user holds a writing tool.