An image scanning apparatus includes: a reflective document lamp that emits light to the surface of a reflective document; a carriage that has the reflective document lamp and an image sensor for detecting light and converting the detected light into an electric signal mounted thereon and reciprocates in a sub-scanning direction; an indicator lamp that emits light and indicates the state of the apparatus; a determining unit that determines whether the reflective document lamp is turned on by using the image sensor; and a control unit that controls the on or off state of the reflective document lamp, the on or off state of the indicator lamp, and the movement of the carriage. In the image scanning apparatus, when the determining unit determines that the reflective document lamp is not turned on, the control unit moves the carriage to a predetermined position such that the indicator lamp emits light to the reflective document lamp.