An imaging apparatus includes: a plurality of column amplifiers, each outputting, based on the same one pixel, first and second pixel signals derived by amplifying the signal by different amplifying factors p and q; a plurality of column A/D converters for performing analog to digital conversion of the first and second pixel signals obtained; a plurality of replacing units, each selecting the first pixel signal converted by the corresponding column A/D converter when the first pixel signal converted by the corresponding column A/D converter is smaller than a threshold value, and selecting the second pixel signal converted by the corresponding column A/D converter when the first pixel signal converted by the corresponding column A/D converter is equal to or larger than the threshold value; and a horizontal scanning circuit for successively selecting the first or second pixel signals selected by the replacing units.