1. A color imaging element comprising: first group pixels which are formed with photoelectric conversion elements arrayed in a matrix pattern at a predetermined pixel interval in each of a horizontal direction and a vertical direction; second group pixels which are formed with photoelectric conversion elements arrayed at positions shifted half the predetermined pixel interval from each photoelectric conversion element of the first group pixels in each of the horizontal direction and the vertical direction; and color filters which are arrayed on each of the first and second group pixels according to a same specific color filter array, wherein the color filter array includes a basic array pattern in which first filters corresponding to a first color with one or more colors and second filters corresponding to a second color with two or more colors whose contribution rates for acquiring a brightness signal are lower than a contribution rate of the first color are arrayed, and is formed by repeatedly arranging the basic array pattern in the horizontal direction and the vertical direction, one or more of the first filters are arranged on each line in horizontal, vertical, diagonal upper right and diagonal lower right directions of the color filter array, one or more of the second filters corresponding to each color of the second color are arranged on each line in the horizontal and vertical directions of the color filter array in the basic array pattern, and a ratio of a number of pixels of the first color corresponding to the first filters is greater than a ratio of a number of pixels of each color of the second color corresponding to the second filters.