1. A multi-port solid-state imaging device comprising: an imaging region including a plurality of pixel columns; and a plurality of units that generate signals based on charges from the imaging region, each of the units having: an output register that transfers a charge from one or more corresponding pixel columns out of the plurality of pixel columns; a plurality of multiplication registers that receive the charge from the output register to generate multiplied charges individually, the multiplication registers being arranged in parallel; and an amplifier that generates a signal based on the multiplied charges from the plurality of multiplication registers.