PURPOSE: To provide a nailing device capable of fixing lumber, metal and the like on an ALC material easily.

CONSTITUTION: A nailing device 15 consists of a nailing part 16 using public compressed air as a driving source, and a nail supplying part 17 for supplying, to the nailing part 16, nails 1 each of which is formed in such a way that a major axis and a minor axis are joined to each other at their top end parts and a flange part for nailing is provided on the minor axis. In the nail supplying part 17, the nail 1 which is supported by a connecting member 10 is continuously supplied on the nailing position of the nailing part 16. A nailing track restricting mechanism is provided on the guide part 25 of the nail supplying part 17 so as to prevent quake of the nail 1 at the time of nailing.