Image reading unit and image reader

An image reader operable to read images including first and second original images, comprising:

• an image reading unit comprising:
• a first image reading element array including a plurality of photoelectric conversion elements which are linearly disposed;
• a second image reading element array including a plurality of photoelectric conversion elements which are linearly disposed, the second image reading element array being disposed parallel to the first image reading element array;
• a base supporting the first and second image reading element arrays disposed on a same plane thereon;
• a first rod lens member configured to focus the first original image, disposed at a first focal position, onto the first image reading element array;
• and
• a second rod lens member configured to focus the second original image, disposed at a second focal position, onto the second image reading element array,
• wherein the second rod lens member has a conjugation length different from a conjugation length of the first rod lens member;
• a movable unit moving the image reading unit relative to at least one of the first original image and the second original image;
• and
• a holder and an original table adapted to support originals including first and second originals,
• wherein the original table directly supports the first original thereon, and
• wherein the holder accommodates the second original at a predetermined location above the original table, a distance between the predetermined location and the original table corresponding to a difference between the conjugation length of the first rod lens member and the conjugation length of the second rod lens member.