Provided is an imaging device including a lens unit and a device body detachably joined with each other. The lens unit includes an optical lens, an image sensor capturing an optical image of a subject having transmitted through the optical lens and outputting an output signal, and an image processing unit executing a plurality of image processings on image data generated from the output signal of the image sensor. The device body includes a display unit displaying the image data, a storage unit storing an image file containing the image data and an image processing unit having a substantially same image processing function as that of the lens unit and executing a plurality of image processings on the image data. The imaging device is configured that the image processings to execute on the image data are changeably allocated to the image processing units of the lens unit and the device body.