Mouthpiece-type removable corrective devices have plentiful room for improvement in order to increase therapeutic effect by applying necessary corrective force and moving teeth. This mouthpiece-type removable orthodontic device includes: a mouthpiece 1 that is mounted on a row of teeth in an upper jaw or a lower jaw; and a concave section 3R1 formed in the mouthpiece and mounted on a tooth to be moved. The concave section includes: an abutting inner surface that abuts the crown of the tooth to be moved at the before and after movement positions of the tooth; and a movement space that follows a movement line that joins the positions of the crown before and after the movement. Moreover, this mouthpiece-type removable orthodontic device includes: a tooth flank pad 20, abutting a tooth flank on the start-of-movement side of the crown before the movement, for imparting corrective force to the tooth flank; and an attachment section 17 that is disposed on an inner surface of the concave section, for attaching the tooth flank pad.
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