To provide a tool for conducting stacking work for a steel sheet pile safely, easily, and efficiently.

A rectangular steel sheet pile support member 13 is provided with a bearing 24 at a position proportionally dividing the support member into the long side 13a and the short side 13b. A rotary shaft 15 is inserted in the bearing 24, and fastened with a bolt to an H-shape member rotatably in a quarter circle. The short side 13b is locked in a lock part 16 of a stopper 14, and the steel sheet pile 12 is placed on the other long side 13a. The stopper 14 locks and releases the short side 13b by an interlock between the vertical movement of an operation rod 18 and a spring 19. The long side 13a is rotated by a quarter circle around the rotary shaft 15 and lowered by the load of the steel sheet pile 12 when the lock part 16 of the stopper 14 is released by lowering the operation rod 18, and is formed in a length and a shape to be stored on the web side 23 of the H-shape member. Furthermore, the mounting part 20 of this tool has the same shape as that of an object to be mounted and is formed to have an insertable measurement, and is mounted and dismounted by holding and sliding handles 21.