An image-reading device includes a linear image sensor and a cable. The linear image sensor is divided into, at least, first, second and third blocks. The first block is disposed adjacent to the second block. Each block reads images on an original document and generates image signals. The cable includes, at least, first, second and third signal wires corresponding to the first, second and third blocks respectively. Each signal wire transmits the image signals generated by each block. The third wire is sandwiched between the first signal wire and the second signal wire.