An image sensor capable of performing satisfactory distortion aberration correction on an imaging result, regardless of a combination of a lens module and an imaging module being used, is provided. A main body module of an image sensor acquires form information of each module from an imaging module and a lens module which are mounted thereon, acquires size information indicating a number of pixels and/or a pixel size of an imaging element within the imaging module and distortion aberration characteristic information indicating distortion aberration characteristics of an optical system within the lens module from a predetermined device on the basis of the acquired form information, and performs distortion aberration correction using the acquired information.