An imaging apparatus for outputting image signals by photoelectrically converting an image formed at an optical system by an image sensor array having a color filter array having several spectral transmittance disposed in front thereof, including: mode setting means capable of setting at least one mode among an all-pixel read mode for effecting readout of all the pixels of at least one horizontal line, an intermittent read mode for effecting readout in a thinned-out manner of pixels to be read out from at least one horizontal line, and an averaging read mode for effecting readout by averaging a plurality of pixels as the mode for reading out image signals from the image sensor array; and readout rule control means for controlling and determining pixel locations for reading out the image signals: when the intermittent read mode and/or the averaging read mode have been set by the mode setting means, the readout pixel locations to be determined by the readout rule control means are caused to vary frame by frame in the image signals to be read out.