1. A cell culture device provided with a storage container capable of forming a space sealed off from outer atmosphere, in which the following devices are disposed: an incubator for cell culturing; a light source for irradiating light to the cells in culture process in the incubator; and an image acquiring device for imaging the cells in culture process, placed in the back of the incubator with respect to the light source, as well as comprising means for processing images acquired by the image acquiring device and creating image data for extracting the cells.