Abstract: An image capturing device includes a cube prism and three image capturing units. The cube prism includes an incident surface, a first exiting surface, a second exiting surface, and a third exiting surface orthogonal to each other, and further includes a first splitting surface, a second splitting surface, a third splitting surface, and a forth splitting surface orthogonal to each other. The light incident into the incident surface is split by the four splitting surfaces into monochromatic lights, and the monochromatic lights respectively exit from the three exiting surfaces to be received by the image capturing units to form images. The images can be combined as a multicolored image. Accordingly, the light-use efficiency and the image resolution can be improved, and the color fault of the image can be avoided.