The present invention is an orthodontic connection tool for attaching, to a screw (2, 2A, 2B) embedded in a bone in the oral cavity, an upper structural element (4) to which an orthodontic tool is fixed, the orthodontic connection tool including a base plate (11) engageable with the screw, and a structural-element attachment tool (30, 30A, 30B, 30C, 30D) that engages with the base plate at an arbitrary position thereof and that fixes the upper structural element in a detachable manner.