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1. A sheet transport device comprising:
a sheet supporting surface configured to support one or more sheets thereon; a separation roller configured to separate, one by one, the one or more sheets supported by the sheet supporting surface to transport a separated sheet in a predetermined transport direction; and a first detection unit disposed to the sheet supporting surface and configured to detect whether a sheet is set on the sheet supporting surface, wherein the separation roller and the first detection unit are disposed to be separated at least in a sheet width direction orthogonal to the predetermined transport direction, and a distance between the first detection unit and an end edge of the separation roller at a side of the first detection unit is longer than a short side of a non-allowable sheet which is smaller than a minimum sheet size within an allowable transport range set in the sheet transport device.
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