To provide a concrete uneven step casting method and a concrete uneven step casting device capable of finishing the upper surface and the lower surface of an uneven step with a high degree of accuracy by a simple execution method without being required for skill when the uneven step or a groove having uneven steps on both sides and a stair as a continuous body of the uneven step are formed by placing concrete.

The lower ends of both screw bolts 5 formed in inverse screws opposed to each other in the direction of the axis are screwed to a female screw 7a fixed to a substrate to erect, at the same time, both screw bolts 5 are screwed to an uneven step form 2 for prescribing the upper surface, the lower surface and the sides of the uneven step S to be formed in the direction of the height, and after the solidification of concrete after the concrete has been cast with the upper end and the lower end of the uneven step form 2 as the standard, both screw bolts 5 of the uneven step form 2 are rotated to remove the uneven step form 2, and the upper surface, the sides and the lower surface of the concrete uneven step S can be accurately formed.