An image forming apparatus for detecting surface conditions of a recording sheet on which an image is to be formed, comprising: a light source (42, 42A, 42B) that emits a first light beam and a second light beam wherein a straight line including a ray in a center of the first light beam and a straight line including a ray in a center of the second light beam intersect with each other, when each straight line is projected on the surface of the recording sheet; an image capture device including a first image capture portion and a second image capture portion, the first image capture portion being configured to capture a first image of the surface of the recording sheet illuminated with the first light beam, and the second image capture portion being configured to capture a second image of the surface of the recording sheet illuminated with the second light beam on the surface of the recording sheet as a second image; and a detector arranged to detect information about the unevenness on the surface of the recording sheet based on the first image and the second image; wherein a first area captured as the first image and a second area captured as the second image are on the same surface of the recording sheet; characterised in that: an area illuminated by the first light beam and an area illuminated by the second light beam are arranged on a straight line perpendicular to a conveyance direction of the recording sheet; and the first area captured as the first image and the area illuminated by the second light beam do not overlap each other on the surface of the recording sheet, and the second area captured as the second image and the area illuminated by the first light beam do not overlap each other on the surface of the recording sheet. a light source (42, 42A, 42B) that emits a first light beam and a second light beam wherein a straight line including a ray in a center of the first light beam and a straight line including a ray in a center of the second light beam intersect with each other, when each straight line is projected on the surface of the recording sheet; an image capture device including a first image capture portion and a second image capture portion, the first image capture portion being configured to capture a first image of the surface of the recording sheet illuminated with the first light beam, and the second image capture portion being configured to capture a second image of the surface of the recording sheet illuminated with the second light beam on the surface of the recording sheet as a second image; and a detector arranged to detect information about the unevenness on the surface of the recording sheet based on the first image and the second image; wherein a first area captured as the first image and a second area captured as the second image are on the same surface of the recording sheet; characterised in that: an area illuminated by the first light beam and an area illuminated by the second light beam are arranged on a straight line perpendicular to a conveyance direction of the recording sheet; and the first area captured as the first image and the area illuminated by the second light beam do not overlap each other on the surface of the recording sheet, and the second area captured as the second image and the area illuminated by the first light beam do not overlap each other on the surface of the recording sheet. an area illuminated by the first light beam and an area illuminated by the second light beam are arranged on a straight line perpendicular to a conveyance direction of the recording sheet; and the first area captured as the first image and the area illuminated by the second light beam do not overlap each other on the surface of the recording sheet, and the second area captured as the second image and the area illuminated by the first light beam do not overlap each other on the surface of the recording sheet.