Abstract
An object holding method includes: a step of determining a center of a first object assumed to be held by an end effector for a plurality of holding postures which the end effector is able to take; a step of measuring a shape of a second object based on an image in which the second object is captured from a viewpoint; a step of selecting a holding posture when the end effector holds the second object from the holding postures based on centers of the second object and the first object; and a step of reducing a portion of the shape of the second object in a case where the end effector holds the second object by using the selected holding posture.