A holding apparatus configured to hold an optical element includes a supporting member configured to support the optical element, a cylindrical member configured to support the supporting member, a plurality of sensors configured to detect a position of the optical element and the supporting member, and a drive unit configured to drive the supporting member based on outputs from the plurality of sensors. The supporting member includes a plurality of projection portions that contact the optical element. A direction of each vertex of a polygon formed by connecting the plurality of projection portions with a straight line substantially coincides with a direction of each vertex of a polygon formed by connecting the plurality of sensors with a straight line.