A solid-state imaging device comprising: a plurality of pixels arranged in both row and column directions, each of the pixels comprising: a photoelectric conversion element configured to photoelectrically convert incident light so as to accumulate signal charges; a charge-voltage conversion terminal configured to voltage-convert signal charges accumulated in the photoelectric conversion element into voltage signals; a voltage signal output means configured to amplify signals voltage-converted by the charge-voltage conversion terminal; a transfer means configured to transfer signal charges accumulated in the photoelectric conversion element to the charge-voltage conversion terminal; and a first reset means configured to switch between conduction and disconnection to a power source having a first reset voltage for the charge-voltage conversion terminal by on-off control; a plurality of first signal lines capable of being kept in a floating potential state, each of the first signal lines being connected to the pixels in a single column; a first scanning means configured to select the pixels that output respective signals to the respective first signal lines via the voltage signal output means corresponding to each of the pixels; constant current circuit elements configured to turn on and off the supply of constant current to the respective first signal lines; and a control circuit, characterized in that the control circuit is configured to execute a noise signal read-out operation in which each of the charge-voltage conversion terminals in the respective pixels in one row selected by the first scanning means is reset to the first reset voltage by turning on the first reset means and then rendered to be in a floating potential state by turning off the first reset means; with constant current being supplied to the first signal lines by turning on the constant current circuit elements, each voltage at each of the charge-voltage conversion terminals is read out to each of the first signal lines via each voltage signal output means for a predetermined period of time so that each voltage is stored in each of the first signal lines; and noise signals in the respective pixels in the one row are output by turning off the constant current circuit elements and reading out each voltage stored in each of the first signal lines, and wherein the control circuit is configured to execute an optical signal read-out operation in which signal charges accumulated in each of the photoelectric conversion elements in the respective pixels in one row selected by the first scanning means are transferred to each of the charge-voltage conversion terminals by the transfer means; with constant current being supplied to the first signal lines by turning on the constant current circuit elements, each signal voltage-converted by each of the charge-voltage conversion terminals is read out to each of the first signal lines via each voltage signal output means for the predetermined period of time so that each voltage signal is stored in each of the first signal lines; and optical signals in the respective pixels in the one row are output by turning off the constant current circuit elements and reading out each voltage signal stored in each of the first signal lines. a plurality of pixels arranged in both row and column directions, each of the pixels comprising: a photoelectric conversion element configured to photoelectrically convert incident light so as to accumulate signal charges; a charge-voltage conversion terminal configured to voltage-convert signal charges accumulated in the photoelectric conversion element into voltage signals; a voltage signal output means configured to amplify signals voltage-converted by the charge-voltage conversion terminal; a transfer means configured to transfer signal charges accumulated in the photoelectric conversion element to the charge-voltage conversion terminal; and a first reset means configured to switch between conduction and disconnection to a power source having a first reset voltage for the charge-voltage conversion terminal by on-off control; a photoelectric conversion element configured to photoelectrically convert incident light so as to accumulate signal charges; a charge-voltage conversion terminal configured to voltage-convert signal charges accumulated in the photoelectric conversion element into voltage signals; a voltage signal output means configured to amplify signals voltage-converted by the charge-voltage conversion terminal; a transfer means configured to transfer signal charges accumulated in the photoelectric conversion element to the charge-voltage conversion terminal; and a first reset means configured to switch between conduction and disconnection to a power source having a first reset voltage for the charge-voltage conversion terminal by on-off control; a plurality of first signal lines capable of being kept in a floating potential state, each of the first signal lines being connected to the pixels in a single column; a first scanning means configured to select the pixels that output respective signals to the respective first signal lines via the voltage signal output means corresponding to each of the pixels; constant current circuit elements configured to turn on and off the supply of constant current to the respective first signal lines; and a control circuit,