The present invention relates to a multipurpose exercise apparatus. More specifically, the multipurpose exercise apparatus is configured so that various kinds of exercise can be done by turning a crescent-shaped main body up and down according to the kind of exercise desire by a user, and by stepping on the main body to mount thereon or sitting down thereon, thereby allowing exercise to be enjoyed regardless of place or time and to even be enjoyed outdoors in addition to indoors and the efficiency of exercise can be maximized even with simple exercise movements. The present invention is characterized in that it has a plate shape, and it comprises a main body (100), wherein a convex surface (10) is formed at the upper part, a concave surface (20) is formed at the lower part, a handle groove (12) is provided at both the terminal parts descending along the curvature of the convex surface (10), and a supporting protrusion (22) is integrally projected at the lower part of the handle groove (12) so as to allow the main body to be separated by a certain distance from the ground; and a handle (200) which is installed on one side of the upper convex surface (10) of the main body (100) and can be attached thereto or detached therefrom.