A scanner according to an embodiment includes a housing, an imaging device provided in the housing, and a light source. The housing has an imaging window. The imaging window is sectioned by an upper side portion, a lower side portion, and a pair of side portions. The lower side portion is spaced apart from the upper side portion. The pair of side portions connect respective ends of the upper side portion and the lower side portion. The imaging device picks up, via the imaging window, an image of a reading target present in a reading area formed on the outer side of the housing through the imaging window and outputs image data of the reading target. The light source is located on the outer side of the reading area and arranged along each of the side portions of the housing and irradiates illumination light on the reading area.