The pixel circuit of the image sensor includes one or more photoelectric conversion elements that generates charges in response to incident light, a first capacitance that receives and stores the charges generated in the one or more photoelectric conversion elements, a second capacitance that is connected to the first capacitance via a switch, and a comparator that compares the amount of charges stored in the first capacitance with a predetermined value. The second capacitance is connected to the first capacitance via the switch, and the pixel circuit includes a comparator that compares the amount of the charges stored in the first capacitance with a predetermined value. When the amount of the charges accumulated in the first capacitance in the comparator is greater than the predetermined value, the switch is turned on and the charges are accumulated by the capacitance that is the sum of the first capacitance and the second capacitance.