PURPOSE: To obtain an image pickup device which takes the photographed picture of high quality by increasing the number of effective picture elements through the use of a usual image pickup element, and simultaneously, is of high power-saving affect.

CONSTITUTION: Image pickup light L having passed through a lens 1 is divided into plural beams L1, L2 of equal quantity of light by a beam splitter 2, and they are made to image-form on imaging planes A, B at positions different from each other. Then, picture information from each image pickup element 101 to 104 whose light receiving part is arranged at a divided position not neighboring when the images of a subject on each imaging plane A, B are divided into plural parts is synthesized by a picture synthesis circuit 3. Besides, a focus drive circuit 10 and a diaphragm drive circuit 12 set a photographing condition by using the output of one of the image pickup elements.