To provide a load-carrying platform structure which allows loading irrespective of the kind or shape of a load, reliably secures the load onto the load-carrying platform, and does not cause a decrease in the full load capacity. In a structure in which a frame includes a load-carrying platform, and wall portions are provided in the outer periphery of the loading portion of the load-carrying platform with recesses being provided in the inner wall surfaces of the wall portions. Hooks for securing the load in place are provided in the respective recesses so as to fit within the inner wall surfaces of the wall portions.