A method for correcting distortion of a captured image is provided. The method includes receiving a detection output from a sensor; optically correcting distortion of a captured image in image data from the element due to the positional change of the imaging element by controlling a control mechanism depending on the detection output in the receiving step, the mechanism being configured to control a position at which incident light from a target object enters the imaging element; receiving image data resulting from the optical correction of a captured image in the correcting step from the element, and detecting a motion vector per one screen of a captured image from the image data; and further correcting distortion of a captured image due to the positional change of the imaging element for the image data from the imaging element based on the motion vector detected in the motion vector detecting step.