Provided is an imaging system capable of preventing exposure unevenness and expanding an illumination control range. The imaging system 1 includes an illumination unit 41 that emits illumination light to illuminate a subject, a light receiving unit 244f in which pixels that receive light and photoelectrically convert the received light to generate an electric signal are two-dimensionally arranged, a read unit 244g that sequentially reads the electric signal from the pixels for each horizontal line, and an illumination controller 42 that causes the illumination unit 41 to emit illumination light during a period which straddles adjacent two lines and which is a part of read periods of the read unit 244g with respect to adjacent lines, and controls illumination periods in the respective lines to be equal to each other at every two lines in the light receiving unit 244f to thereby cause the illumination periods for the respective lines in the light receiving unit 244f in one frame to be equal to each other.
