A vehicle monitor system includes: a detection unit that detects a vehicle located on the rear lateral side of a host vehicle; a rear lateral imaging unit that images a prescribed angle range on the rear lateral side of the host vehicle; a display unit that displays an image captured by the rear lateral imaging unit; and an image processor that extracts a first image in a range of a first angle with reference to a rear side of the host vehicle from the captured image, and displays the extracted first image on the display unit, wherein when the vehicle is detected by the detection unit, the image processor extracts the first image and a second image in a range of a second angle greater than the first angle with reference to the rear side from the captured image, and displays the first and second images on the display unit.