An object of the present invention is to reduce capacitance of a charge accumulation part (floating diffusion) of each pixel unit. In an imaging device, in addition to a plurality of first switching transistors for coupling a plurality of coupling wires extending in the column direction, a second switching transistor is provided between each of the coupling wires and a floating diffusion in each pixel unit. Preferably, the gate of the first switching transistor and the gate of the second switching transistor are electrically coupled to each other.