Provided is an exercise implement capable of suppressing positional displacement when a user performs jiggling.An exercise implement 1 is provided with a placement unit (smooth surface 5a) on which both feet of a user are placed, a main body portion 5 which has an arcuate portion 5b (curved surface) and which rotates over a prescribed range as a result of both feet of the user, placed on the placement portion, moving alternately, and a restricting means for restricting movement of the main body portion 5 in a horizontal plane. The restricting means includes a groove portion 5c formed by removing a portion of the arcuate portion 5b of the main body portion 5, and a columnar body 3 which is fitted into the groove portion 5c.
