An imaging apparatus comprises an imaging device which images an image, an exterior member which contains the imaging device, an interior member which is arranged inside of the exterior member and contains the imaging device, a heat insulator arranged between the exterior member and the interior member, for thermally insulating between the exterior member and the interior member, and a cooling unit configured to cool the imaging device and the interior member respectively and radiating heat that is absorbed from the imaging device and the interior member to the exterior member independently.