Image reading device and image reading and forming apparatus

An image reading device, comprising:

• a first image reading platform and a second image reading platform arranged in a first direction and separated from each other with a separation member;
• an image reading element and a carriage equipped with a pair of sliding members, the image reading element and the carriage being movable between a first position facing the first image reading platform and a second position facing the second image reading platform;
• and
• a pair of protrusions that is arranged to correspond to the pair of sliding members and that contacts the pair of sliding members while the carriage moves from the first position to the second position, wherein
• the pair of protrusions extend from the first image reading platform to the second image reading platform in the first direction, and
• the pair of protrusions protrudes further toward the image reading element beyond a bottom surface of the first image reading platform, a bottom surface of the second image reading platform and a bottom surface of the separation member.