In a solid-state image sensor, first and second column readout lines are provided to each pixel column, pixel rows are divided into pixel rows of first and second groups, the first group is divided into subgroups each formed from pixels of an identical color, the second group is divided into subgroups each formed from pixels of an identical color, signals from pixels of the pixel rows of the first group are output to the first column readout lines, and signals from pixels of the pixel rows of the second group are output to the second column readout lines. Pixels of an identical subgroup in an identical pixel column share a conversion region and an amplification element, a given conversion region and another conversion region included in a pixel column identical to a pixel column of the given conversion region do not intersect with each other.