An image sensing apparatus having a pixel array with a plurality of pixels, comprises an amplification unit, wherein the amplification unit amplifies a difference-voltage between a voltage level input corresponding to signals output from the pixel array and a reference voltage level, outputs a non-inverted output signal to a first output signal line, and outputs an inverted output signal to a second output signal line and a switch short-circuiting the first output signal line and the second output signal line in response to a reset signal.