To efficiently ease the temperature rise of image pickup elements by surely preventing the temperature rise of an image pickup element in driving, while easily carrying out highly accurate assembly and making each image pickup element contact a cooling element.

An image pickup device 1 that is fixed on a camera casing 2 is provided with a plurality of color separation prisms 3 for separating incident light to prescribed color components, image pickup elements 4 fixed to the color component light projection sides 3aa, 3b, 3c of respective prisms 3, an image pickup element substrate 6 for processing image pickup element signals, cooling elements 8 whose cooling faces are arranged on the elements 4, heat conduction plates 7 attached to the heating faces of the elements 8. The image pickup element cooling means for cooling the image pickup elements 4 is constituted of the cooling elements 8, the heat conduction plates 7, a radiation plate 9, and the camera casing 2. The plates 7 to which the elements 8 are attached are fixed detachably to the radiation plate 9.