A lens unit is detachably connected via a communication interface with a camera body having a strobe and constituting a camera device. The lens unit is configured to include an optical system including a lens; an imaging unit including an image sensor which photo-electrically converts light from a subject having transmitted through the lens; an image processor which generates image data from an output of the imaging unit; and a strobe controller which controls a flash operation of the strobe provided in the camera body in accordance with a release signal from the camera body.