SOLID-STATE IMAGE PICKUP DEVICE

A solid-state image pickup device includes an optoelectronic conversion unit, a first optical signal accumulation unit, a second optical signal accumulation unit, and a combining unit, in which the first optical signal accumulation unit accumulates a first optical signal obtained by the optoelectronic conversion by the optoelectronic conversion unit in a first period, the second optical signal accumulation unit accumulates a second optical signal obtained by the optoelectronic conversion by the optoelectronic conversion unit in a second period, the second period being shorter than the first period, and the combining unit combines the second optical signal with the first optical signal when a noise in the first optical signal is equal to or larger than a noise in the second optical signal.