To prevent abnormal deformation of a hole or rack provided on a rail engaged with a driving wheel of a single rail carrier, maintain a constant pitch of the hole or rack, eliminate ununiformity in engagement with the driving wheel due to broadening of the hole or rack, and improve durability of the rail.

The rail joining structure for the single rail carrier is characterized by that a joining member 5 is provided for pulling and fastening a supporting member 4 of the rail to an adjacent rail supporting member (a strut) 4, or a support fitting 3 for the rail to an adjacent rail support fitting 3, provided at a rail joint part of the single rail carrier traveling by acquiring thrust by the driving wheel engaged with the hole or rack provided on the rail 1.