To provide a fastening mechanism refastening a wire rope for loading without climbing up on a load placed on a truck deck.

This fastening mechanism 10 for a wire rope 4 loading which is used to secure a load 3 to the deck 2 of a truck 1 is equipped with a slide box 11 attached to the side portion of a chassis frame 6 which extends in the longitudinal direction on the bottom surface of the truck deck so as to be slid in the vehicle lateral direction. A wire rope arrester 26 is slidable in the vehicle lateral direction along a bolt 12 disposed in the slide box. The slide box 11 can also be slid in the vehicle lateral direction. Since the wire rope 4 can be reliably fastened by two steps of slides, fastening operation is performed without climbing up on a load.