An information provision system mounted on a vehicle includes: a visual device configured to visually provide information to an occupant of the vehicle; and a controller configured to control the visual device. The controller is further configured to: cause the visual device to provide first information in a first period; cause the visual device to provide second information different from the first information in a second period later than the first period; and set at least one of a luminance and a saturation of the visual device in at least a part of an information switching period between the first period and the the second period to be lower than that in the first period and the second period.