Stereoscopic imaging device and shading correction method

Provided is a technique for improving the quality of an image obtained by a pupil-division-type stereoscopic imaging device. First and second images obtained by the stereoscopic imaging device according to the present invention have the shading of an object in a pupil division direction. Therefore, when the first and second images are composed, reference data in which shading is cancelled is generated. The amount of shading correction for the first and second images is determined on the basis of the reference data and shading correction is performed on the first and second images on the basis of the determined amount of shading correction.