A photoelectric conversion apparatus comprising: a first substrate including a pixel array; a second substrate including a readout circuit configured to read out a pixel signal from the pixel array; and a drive terminal arranged on one of the first substrate and the second substrate to which a drive potential being ground potential or a power supply potential is externally applied, wherein 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, wherein the readout circuit includes a signal input node to which a signal from the pixel array is provided, and a direction in which a potential of the signal provided to the signal input node from the pixel array changes due to noise is same as a direction in which the drive potential applied to the first node changes due to the noise, a differential amplifier (220; 530) including a first input terminal and a second input terminal, a current source arranged in a path connecting a column signal line of the pixel array and the second node, a first capacitor (230; 540) arranged in a path connecting the column signal line and the first input terminal, a second capacitor (250; 520) arranged in a path connecting the first node and the second input terminal, and a supply source (260; 500) configured to supply a reference potential to the second input terminal. a first substrate including a pixel array; a second substrate including a readout circuit configured to read out a pixel signal from the pixel array; and a drive terminal arranged on one of the first substrate and the second substrate to which a drive potential being ground potential or a power supply potential is externally applied, wherein 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, wherein the readout circuit includes a signal input node to which a signal from the pixel array is provided, and a direction in which a potential of the signal provided to the signal input node from the pixel array changes due to noise is same as a direction in which the drive potential applied to the first node changes due to the noise, a differential amplifier (220; 530) including a first input terminal and a second input terminal, a current source arranged in a path connecting a column signal line of the pixel array and the second node, a first capacitor (230; 540) arranged in a path connecting the column signal line and the first input terminal, a second capacitor (250; 520) arranged in a path connecting the first node and the second input terminal, and a supply source (260; 500) configured to supply a reference potential to the second input terminal. a signal input node to which a signal from the pixel array is provided, and a direction in which a potential of the signal provided to the signal input node from the pixel array changes due to noise is same as a direction in which the drive potential applied to the first node changes due to the noise, a differential amplifier (220; 530) including a first input terminal and a second input terminal, a current source arranged in a path connecting a column signal line of the pixel array and the second node, a first capacitor (230; 540) arranged in a path connecting the column signal line and the first input terminal, a second capacitor (250; 520) arranged in a path connecting the first node and the second input terminal, and a supply source (260; 500) configured to supply a reference potential to the second input terminal.