An auxiliary apparatus for inserting a pin into a broken bone enhances the precision of an orthopedic medical operation. The auxiliary apparatus includes a shaft including a drill chuck part installed at its outer front end, a handle mounting part disposed at its middle portion, and a tool joint part formed at its rear end, in which a pin inserting hole is formed through an inner side of the shaft, a staged portion and a locking groove formed at the handle mounting part, and a cap bolt inserted into the tool joint part. A support handle is rotatably mounted onto the handle mounting part of the shaft. A shaft inserting hole is formed through in the support handle. An engaging hole for receiving a release prevention bolt and a joint groove are formed at a radial outer side of the support handle.