An apparatus for capturing a stereoscopic image, the apparatus comprising: a right imaging unit which has a right imaging axis and generates right-eye image data having a right image center point; and a left imaging unit which has a left imaging axis and generates left-eye image data having a left image center point, the right-eye image data and the left-eye image data having binocular parallax for making a viewer sense a stereoscopic image, wherein the apparatus further comprises: an information storage unit which stores position information indicating a position of a right correction point obtained by moving a right mark in the right-eye image data by a differential vector and a position of a left correction point obtained by moving a left mark in the left-eye image data by the differential vector, wherein the right mark indicates the right imaging axis of the right imaging unit, the left mark indicates the left imaging axis of the left imaging unit, and the differential vector is a vector having a center point of a connection line that, in a plane where the right-eye image data and the left-eye image data are superimposed such that a center point of the plane corresponds to the right image center point and the left image center point, a right mark of the plane corresponds to the right mark of the right-eye image data, and a left mark of the plane corresponds to the left mark of the left-eye image data, connects the right mark of the plane and the left mark of the plane as an initial point and the center point of the plane as a terminal point; and a cutout control unit which, based on the position information, cuts out right partial image data from the right-eye image data by using the right correction point as a cutout center and left partial image data from the left-eye image data by using the left correction point as a cutout center, the right partial image data and the left partial image data having a same size as each other. a right imaging unit which has a right imaging axis and generates right-eye image data having a right image center point; and a left imaging unit which has a left imaging axis and generates left-eye image data having a left image center point, the right-eye image data and the left-eye image data having binocular parallax for making a viewer sense a stereoscopic image, wherein the apparatus further comprises: an information storage unit which stores position information indicating a position of a right correction point obtained by moving a right mark in the right-eye image data by a differential vector and a position of a left correction point obtained by moving a left mark in the left-eye image data by the differential vector, wherein the right mark indicates the right imaging axis of the right imaging unit, the left mark indicates the left imaging axis of the left imaging unit, and the differential vector is a vector having a center point of a connection line that, in a plane where the right-eye image data and the left-eye image data are superimposed such that a center point of the plane corresponds to the right image center point and the left image center point, a right mark of the plane corresponds to the right mark of the right-eye image data, and a left mark of the plane corresponds to the left mark of the left-eye image data, connects the right mark of the plane and the left mark of the plane as an initial point and the center point of the plane as a terminal point; and a cutout control unit which, based on the position information, cuts out right partial image data from the right-eye image data by using the right correction point as a cutout center and left partial image data from the left-eye image data by using the left correction point as a cutout center, the right partial image data and the left partial image data having a same size as each other. an information storage unit which stores position information indicating a position of a right correction point obtained by moving a right mark in the right-eye image data by a differential vector and a position of a left correction point obtained by moving a left mark in the left-eye image data by the differential vector, wherein the right mark indicates the right imaging axis of the right imaging unit, the left mark indicates the left imaging axis of the left imaging unit, and the differential vector is a vector having a center point of a connection line that, in a plane where the right-eye image data and the left-eye image data are superimposed such that a center point of the plane corresponds to the right image center point and the left image center point, a right mark of the plane corresponds to the right mark of the right-eye image data, and a left mark of the plane corresponds to the left mark of the left-eye image data, connects the right mark of the plane and the left mark of the plane as an initial point and the center point of the plane as a terminal point; and a cutout control unit which, based on the position information, cuts out right partial image data from the right-eye image data by using the right correction point as a cutout center and left partial image data from the left-eye image data by using the left correction point as a cutout center, the right partial image data and the left partial image data having a same size as each other.