An image sensing apparatus comprises a pixel including, a column signal line, a readout circuit, an output line, and an output unit. The readout circuit includes a first accumulation unit, a first opening / closing unit, a second accumulation unit, a transmission unit, and a second opening / closing unit. A capacitance of the first accumulation unit is smaller than a capacitance of the second accumulation unit, and the signal held by the second accumulation unit is read out to the output unit based on the capacitance of the second accumulation unit and the capacitance of the output line.