An MOS type solid state imaging device in which unit pixels 10 each having a photodiode 11, a transfer transistor 12 for transferring the signal of the photodiode 11 to a floating node N11, an amplifier transistor 13 for outputting the signal of the floating node N11 to a vertical signal line 22, and a reset transistor 14 for resetting the floating node N11 are arrayed in a matrix and in which a gate voltage of the reset transistor 14 is controlled by three values of a power source potential (for example 3V), a ground potential (0V), and a negative power source potential (for example −1V).