An imaging apparatus includes a detector having a plurality of conversion elements for converting radiation or light into an electric charge, a power supply unit that supplies a first voltage to the conversion element in a first imaging operation, and a control unit that controls the detector and the power supply unit. During a period between the first imaging operation and a second imaging operation, the control unit controls to perform a first inter-imaging operation in which a second voltage different from the first voltage is supplied to the conversion element, and, subsequently to the first inter-imaging operation, a second inter-imaging operation in which a third voltage different from the first and the second voltages is supplied to the conversion element. The absolute value of the difference between the third and the first voltages is smaller than the absolute value of the difference between the second and the first voltages.
