A scanning apparatus has a light source part scanning a scanning beam on an original document. A frame has a light input part and a light output part. A reflection mirror is arranged in the frame and reflects the scanning beam inputted through the light input part to the light output part along a predetermined light proceeding path. A light receiving part is supported on the light output part, and receives the scanning beam reflected by the reflection mirror. A light source supporting member supports the light source part on the frame so that the beam scanned by the light source part and reflected on the original document passes through the light input part and proceeds along the light proceeding path. The light source supporting member mounts the different light source parts in the frame. Accordingly, the invention provides a scanner which is adaptive to different light resource part with different light characteristic.