A lens unit is provided with two CCD image sensors and a color-separation prism for separating subject light into green light (G light), and a mixture of red light (R light) and blue light (B light). The color-separation prism allows the G light to enter into one of the CCD image sensors, and the mixture of the R and B light to enter into the other CCD image sensor. Sensor moving mechanisms drive the CCD image sensors individually in a plane perpendicular to an optical axis when camera shake is detected, thereby preventing the image from blurring.