1. A single-plate color imaging element including color filters arranged on a plurality of pixels formed by photoelectric conversion elements arranged in horizontal and vertical directions, wherein each of the plurality of the pixels is square, an array of the color filters on the plurality of the square pixels includes a basic array pattern of M×N (M, N: integers 4 or more, at least one of M and N is an odd number, and M≠N) provided with 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 with contribution ratios for obtaining luminance signals lower than the first color, the basic array pattern is repeatedly arranged in the horizontal and vertical directions, the first filters are arranged in a check pattern shape in the basic array pattern, one or more second filters corresponding to each color of the second color are arranged in each line in the horizontal and vertical directions of the array of the color filters in the basic array pattern, and a proportion of the number of pixels of the first color corresponding to the first filters is greater than a proportion of the number of pixels of each color of the second color corresponding to the second filters.