A photoelectric conversion apparatus includes a first substrate including a pixel array, a second substrate including a readout circuit configured to read out a signal from the pixel array, and a drive terminal to which a drive potential is externally applied. The readout circuit includes a first node to which the drive potential is supplied from the drive terminal via an electrically conductive line arranged in the pixel array, and a second node to which the drive potential is supplied from the drive terminal without going through the pixel array.