A detection apparatus comprising: a pixel array in which a plurality of pixels are arranged in a matrix of rows and columns, each pixel including a conversion element that converts radiation or light into electric charge and a transistor that outputs an electrical signal according to the electric charge; a plurality of driving wires, each being connected to gates of a plurality of transistors arranged in a row direction; driving circuit means arranged to include a plurality of unit circuits, provided for the plurality of corresponding driving wires configured to supply conducting voltage and non-conducting voltage of the transistors to the plurality of corresponding driving wires; and control means arranged to supply, to the driving circuit means, a clock signal for defining timing at which the driving circuit means supplies the conducting voltage to the driving wires, wherein the conducting voltage is voltage based on the clock signal, wherein the control means supplies, to the plurality of unit circuits, control voltage for continuing to supply the non-conducting voltage to the driving wires, and wherein, to each of the plurality of unit circuits, the clock signal, an initiation signal for causing the unit circuit to begin to supply the conducting voltage to the corresponding driving wire, and a termination signal for causing the unit circuit to stop supplying the conducting voltage to the corresponding driving wire are input, characterized in that each of the plurality of unit circuits includes a first circuit that supplies the conducting voltage to the corresponding driving wire in accordance with the initiation signal input to the unit circuit, a second circuit that supplies the non-conducting voltage input to the unit circuit to the corresponding driving wire in accordance with the termination signal input to the unit circuit, and a third circuit that continues to supply the non-conducting voltage to the corresponding driving wire in accordance with the control voltage input to the unit circuit, and the control voltage is supplied to the plurality of unit circuits separately from the clock signal, the initiation signal and the termination signal. a pixel array in which a plurality of pixels are arranged in a matrix of rows and columns, each pixel including a conversion element that converts radiation or light into electric charge and a transistor that outputs an electrical signal according to the electric charge; a plurality of driving wires, each being connected to gates of a plurality of transistors arranged in a row direction; driving circuit means arranged to include a plurality of unit circuits, provided for the plurality of corresponding driving wires configured to supply conducting voltage and non-conducting voltage of the transistors to the plurality of corresponding driving wires; and control means arranged to supply, to the driving circuit means, a clock signal for defining timing at which the driving circuit means supplies the conducting voltage to the driving wires, wherein the conducting voltage is voltage based on the clock signal, wherein the control means supplies, to the plurality of unit circuits, control voltage for continuing to supply the non-conducting voltage to the driving wires, and wherein, to each of the plurality of unit circuits, the clock signal, an initiation signal for causing the unit circuit to begin to supply the conducting voltage to the corresponding driving wire, and a termination signal for causing the unit circuit to stop supplying the conducting voltage to the corresponding driving wire are input, characterized in that each of the plurality of unit circuits includes a first circuit that supplies the conducting voltage to the corresponding driving wire in accordance with the initiation signal input to the unit circuit, a second circuit that supplies the non-conducting voltage input to the unit circuit to the corresponding driving wire in accordance with the termination signal input to the unit circuit, and a third circuit that continues to supply the non-conducting voltage to the corresponding driving wire in accordance with the control voltage input to the unit circuit, and the control voltage is supplied to the plurality of unit circuits separately from the clock signal, the initiation signal and the termination signal.