An image pickup system includes: a light source section； an image sensor section including a light-receiving section that performs an image pickup operation using a rolling-shutter method； a trigger signal output section that outputs a trigger signal which represents either a timing at which readout of a first line in one frame is started in the light-receiving section or a timing at which readout of a last line in the one frame has been completed in the light-receiving section； an image adding section that adds images for N frames based on the trigger signal and output the added images； and a light source control section that performs control for starting light emission by the light source section at a timing after a predetermined delay period has elapsed after an input of the trigger signal, and for terminating light emission by the light source section in a period after readout of a first line of the light-receiving section has been completed for an N-1th frame until before readout is started for an Nth frame.
