A photoelectric conversion device comprises an isolation portion defining an active region, a photoelectric converter arranged in the active region and including a charge accumulation region containing an impurity of a first conductivity type, a photoelectric converter arranged in the active region, a transfer electrode arranged on the active region and configured to form a channel to transfer charges generated by the photoelectric converter to the charge voltage converter, a first semiconductor region arranged in the active region between the photoelectric converter and the charge voltage converter, the first semiconductor region being covered with the transfer electrode and containing the impurity of the first conductivity type at a concentration lower than that in the charge accumulation region; and a second semiconductor region extending in the active region along an interface of the isolation portion facing at least the first semiconductor region, the second semiconductor region being of a second conductivity.