A back-illuminated type solid-state imaging device is provided in which an electric field to collect a signal charge is reliably generated to reduce a crosstalk. The method includes the step of blending molten nickel with sufficient molten silicon so that the blend may be cast to form an alloy containing no less than 4. As a result, a change in channel electron concentration in the channel layer is suppressed to prevent a threshold voltage or an on-resistance of the power MISFET from fluctuating.