A solid state imaging apparatus includes: a pixel array in which pixels having color filters are arrayed in a matrix shape in accordance with a predetermined color arrangement, with each pixel including a plurality of divided pixels having a color filter of the same color; and an adding circuit that performs addition averaging of a plurality of signals output from the divided pixels included in a plurality of pixels having color filters of the same color. Among a plurality of pixels that are an object of the addition averaging, a number of signals output from the respective divided pixels of which the adding circuit performs addition averaging is different for at least one pixel relative to the other pixels.