The camera body, the image pickup unit, the imaging system, the method detachable relative to the camera body of the imaging unit, the method attached to the camera body of the image pickup unit, sampling method for the camera body of the image pickup unit

A camera body (1) of the present invention is provided with a concave portion (1A) in which an imaging unit (2) including a rectangular solid shaped case (2a) having an optical system and an imaging device is detachably disposed. When the case (2a) is viewed from a front side in a state where the case (2a) is disposed in the concave portion (1A), the camera body (1) includes a back face portion (1B) having a back face wall (4) located on the back of the case (2a) and facing a back face of the case (2a), a side face portion (1C) having a side face wall (6) facing a side face of the case (2a), and an upper face portion (1D) having an upper face wall (5) facing an upper face of the case (2a). The concave portion (1A) is defined by the back face wall (4), the side face wall (6), and the upper face wall (5), and is open on three sides where the remaining faces of the case (2a) are located at the time of attachment.