Image reading apparatus with transparent guide forming separate arc passages with feed rollers for document insertion and output

An image reading apparatus wherein a first guide roller (143) and a second guide roller (144) are arranged on the document insertion side and feed out side in parallel while sandwiching the document reading position therebetween;

• a transparent guide (145) forming a first arc passage (146) and a second arc passage (147) respectively is formed between said first and second guide rollers;
• a reversing apparatus (167) of the document is arranged between the above-described first guide roller and second guide roller on the side opposite to the transparent guide;
• and optical units (31, 33a, 33b, etc.) for reading the document are arranged on the opposite side to the guide roller of the transparent guide.