1. An image reading device, comprising: an imaging optical system configured to provide a final image conjugate to an object; and an image capturing device configured to capture at least a portion of the final image and read information of the object therefrom, wherein the imaging optical system comprises a first optical system configured to provide an intermediate image conjugate to the object and a second optical system configured to provide the final image conjugate to the intermediate image, and the first optical system comprises a reflection surface having a positive power and the second optical system comprises a lens system having an optical axis and having a positive power.