An imaging device comprising: unit pixel cells each including a first electrode, a second electrode facing the first electrode, a photoelectric conversion layer between the first electrode and second electrode, a charge accumulation region electrically connected to the first electrode, and a signal detection circuit electrically connected to the charge accumulation region; and a voltage supply circuit electrically connected to the second electrode, the voltage supply circuit supplying a first voltage to the second electrode in an exposure period that is a period for accumulating charges generated by photoelectric conversion in the charge accumulation region, the voltage supply circuit supplying a second voltage that is different from the first voltage to the second electrode in a non-exposure period, wherein the start and end of the exposure period is common to the unit pixel cells; characterized in that the photoelectric conversion layer has a photocurrent characteristic between a bias voltage applied between the first electrode and the second electrode and a current density of a current flowing through the photoelectric conversion layer, the photocurrent characteristic including a first voltage range where an absolute value of the current density increases as the bias voltage increases in a reverse direction, a second voltage range where the current density increases as the bias voltage increases in a forward direction, and a third voltage range where an absolute value of a rate of change of the current density relative to the bias voltage is less than in the first voltage range and the second voltage range, the third voltage range being between the first voltage range and the second voltage range, and the voltage supply circuit supplies the second voltage to the second electrode in the non-exposure period such that the bias voltage falls within the third voltage range, and the voltage supply circuit supplies the first voltage to the second electrode in the exposure period such that the bias voltage falls outside the third voltage range. unit pixel cells each including a first electrode, a second electrode facing the first electrode, a photoelectric conversion layer between the first electrode and second electrode, a charge accumulation region electrically connected to the first electrode, and a signal detection circuit electrically connected to the charge accumulation region; and a voltage supply circuit electrically connected to the second electrode, the voltage supply circuit supplying a first voltage to the second electrode in an exposure period that is a period for accumulating charges generated by photoelectric conversion in the charge accumulation region, the voltage supply circuit supplying a second voltage that is different from the first voltage to the second electrode in a non-exposure period, wherein the start and end of the exposure period is common to the unit pixel cells; characterized in that the photoelectric conversion layer has a photocurrent characteristic between a bias voltage applied between the first electrode and the second electrode and a current density of a current flowing through the photoelectric conversion layer, the photocurrent characteristic including a first voltage range where an absolute value of the current density increases as the bias voltage increases in a reverse direction, a second voltage range where the current density increases as the bias voltage increases in a forward direction, and a third voltage range where an absolute value of a rate of change of the current density relative to the bias voltage is less than in the first voltage range and the second voltage range, the third voltage range being between the first voltage range and the second voltage range, and the voltage supply circuit supplies the second voltage to the second electrode in the non-exposure period such that the bias voltage falls within the third voltage range, and the voltage supply circuit supplies the first voltage to the second electrode in the exposure period such that the bias voltage falls outside the third voltage range.