To provide the guide line device of an unmanned carrier which can be laid on a floor with excellent durability.

This guide line device is constituted as the guide line device of an unmanned carrier laid along the raveling road surface of an unmanned carrier in a magnetic guide system. A base board 2 is fixed to the traveling road surface 6, and side boards 3 are fixed to the both sides of the base board 2 with a line space 5 left opened on the base board 2. Then, a magnetic tape type guide line 1 is attached with tacky adhesive agent to the line space 5 on the base board 2.