To provide a device capable of training leg muscles and developing momentary motor judgment by adding motor function to a device provided with projections for pressing the sole of the foot.

On an upper surface of a stepping member composed of a plate-like or sheet-like base member 1 having predetermined thickness and width and a plate-like or sheet-like moving member 3 having predetermined thickness and width or a plurality of such moving members 3 directly or indirectly connected and formed thereon, projections of each number from 1 to any number of a sequence of 5-15, among sequential numbers of at least 1-5 and at most 1-15, are formed at predetermined intervals, and the projections are freely arranged on the upper surface of the stepping member regardless of the sequence. The projections of each sequential number have predetermined height and thickness allowing discrimination of the sequential number, and two or more of the projections showing the number formed on the moving member 3 can be exchanged in the stepping member.