An imaging device, comprising: a plurality of pixels (100-11, 100-12, 100-13, 100-14), each including a photoelectric converter and an amplification transistor; the imaging device being switchable between a reference pixel mode and a source follower pixel mode; wherein, in the reference pixel mode, the amplification transistors of a first pixel and a second pixel of the plurality of pixels (100-11, 100-12, 100-13, 100-14) are connected to form input transistors of a first differential amplifier, the amplification transistors of a third pixel and a fourth pixel of the plurality of pixels (100-11, 100-12, 100-13, 100-14) are connected to form input transistors of a second differential amplifier, the first pixel and the third pixel are set as one of reference pixels and read pixels, the second pixel and the fourth pixel are set as the other one of reference pixels and read pixels, and a constant current source node of the first differential amplifier and a constant current source node of the second differential amplifier are electrically connected, wherein a gate of the amplification transistor of each reference pixel is connected to a first reset voltage, and a gate of the amplification transistor of each read pixel is connected to a second reset voltage different from the first reset voltage; and wherein, in the source follower pixel mode, each pixel (100-11, 100-12, 100-13, 100-14) of the plurality of pixels (100-11, 100-12, 100-13, 100-14) is set as read pixel, and the amplification transistors of the pixels (100-11, 100-12, 100-13, 100-14) are not connected to form input transistors of a differential amplifier. a plurality of pixels (100-11, 100-12, 100-13, 100-14), each including a photoelectric converter and an amplification transistor; the imaging device being switchable between a reference pixel mode and a source follower pixel mode; wherein, in the reference pixel mode, the amplification transistors of a first pixel and a second pixel of the plurality of pixels (100-11, 100-12, 100-13, 100-14) are connected to form input transistors of a first differential amplifier, the amplification transistors of a third pixel and a fourth pixel of the plurality of pixels (100-11, 100-12, 100-13, 100-14) are connected to form input transistors of a second differential amplifier, the first pixel and the third pixel are set as one of reference pixels and read pixels, the second pixel and the fourth pixel are set as the other one of reference pixels and read pixels, and a constant current source node of the first differential amplifier and a constant current source node of the second differential amplifier are electrically connected, wherein a gate of the amplification transistor of each reference pixel is connected to a first reset voltage, and a gate of the amplification transistor of each read pixel is connected to a second reset voltage different from the first reset voltage; and the amplification transistors of a first pixel and a second pixel of the plurality of pixels (100-11, 100-12, 100-13, 100-14) are connected to form input transistors of a first differential amplifier, the amplification transistors of a third pixel and a fourth pixel of the plurality of pixels (100-11, 100-12, 100-13, 100-14) are connected to form input transistors of a second differential amplifier, the first pixel and the third pixel are set as one of reference pixels and read pixels, the second pixel and the fourth pixel are set as the other one of reference pixels and read pixels, and a constant current source node of the first differential amplifier and a constant current source node of the second differential amplifier are electrically connected, wherein a gate of the amplification transistor of each reference pixel is connected to a first reset voltage, and a gate of the amplification transistor of each read pixel is connected to a second reset voltage different from the first reset voltage; and wherein, in the source follower pixel mode, each pixel (100-11, 100-12, 100-13, 100-14) of the plurality of pixels (100-11, 100-12, 100-13, 100-14) is set as read pixel, and the amplification transistors of the pixels (100-11, 100-12, 100-13, 100-14) are not connected to form input transistors of a differential amplifier. each pixel (100-11, 100-12, 100-13, 100-14) of the plurality of pixels (100-11, 100-12, 100-13, 100-14) is set as read pixel, and the amplification transistors of the pixels (100-11, 100-12, 100-13, 100-14) are not connected to form input transistors of a differential amplifier.