Patent ID: 7749788

Claim:
A manufacturing method of a photoelectric conversion device that includes a photoelectric conversion element, a plurality of MOS transistors including a transfer MOS transistor for transferring an electric carrier from the photoelectric conversion element to a first semiconductor region and an amplifying MOS transistor for reading out a signal based on the electric carrier transferred, a wiring layer including a plurality of wirings, a plurality of interlayer insulation layers including a first interlayer insulation layer covering the photoelectric conversion element and the plurality of MOS transistors, a second interlayer insulation layer laminated on the first interlayer insulation layer, first and second electroconductors, a third electroconductor, and a fourth electroconductor, wherein the first electroconductor is buried in a first hole formed in the first interlayer insulation layer for electrically connecting the first semiconductor region to a gate electrode of the amplifying MOS transistor not through the wirings included in the wiring layer, wherein the second electroconductor electrically connects a second semiconductor region different from the first semiconductor region to a first wiring included in the wiring layer, and wherein the second electroconductor includes the third electroconductor buried in a second hole formed in the first interlayer insulation layer and the fourth electroconductor buried in a third hole formed in the second interlayer insulation layer, the third electroconductor and the fourth electroconductor being stacked and electrically connected to each other, the method comprising steps of: burying the first electroconductor in the first hole; and burying the third electroconductor in the second hole, wherein the step of burying the first electroconductor and the step of burying the third electroconductor are performed simultaneously.