Patent ID: 7561199

Claim:
A solid-state image pickup device comprising: a pixel unit having a plurality of photoelectric conversion elements, each of which converts incident light into an electrical signal and outputs the electrical signal; a signal line to which the electrical signals output from said plurality of photoelectric conversion elements are supplied commonly; an amplifier which has an input terminal connected to said signal line through a first capacitor element; and a second capacitor element connected between the input terminal and an output terminal of said amplifier, wherein an adding mode of adding the electrical signals output from said plurality of photoelectric conversion elements and a non-adding mode of not adding the electrical signals output from said plurality of photoelectric conversion elements are executed, and a capacitance value of the first capacitor element is smaller at the time of execution of the adding mode than at the time of execution of the non-adding mode, and an amplification factor of said amplifier is made smaller at the time of execution of the adding mode than at the time of execution of the non-adding mode.