A CCD image sensor is provided with a pixel set. The pixel set is composed of first and second pixels and a microlens. The pixels are arranged side by side in a horizontal direction. The microlens has a hemispheric shape. A diameter of the microlens is larger than a length of a rectangular region, being an external shape of the first and second pixels, in a height direction. The rectangular region has a height and width ratio of approximately 1:2. The pixel sets are arranged in a width direction of the rectangular region to constitute a pixel row. In the CCD image sensor, the pixel rows are arranged in the height direction of the rectangular region, with the adjacent pixel rows shifted from each other in the horizontal direction by half pitch of the rectangular region.