Patent ID: 8571425

Claim:
A detection device comprising: a detection member that includes an emission member emitting a beam toward a transportation direction of a transportation path at which a medium is transported and a beam receiving member receiving a reflected beam of the beam emitted from the emission member, and that detects an image on the medium transported at the transportation path; a transmissive member that is disposed between the transportation path and the emission member and that allows the beam emitted from the emission member and a beam reflected from the medium to be transmitted therethrough; and a support member that has an open portion blocked by the transmissive member, the support member comprising: a first portion that supports an upstream end portion of the transmissive member in the transportation direction of the medium and is provided at a transportation path side below the upstream end portion of the transmissive member, and a second portion that supports an edge portion of a downstream end portion of the transmissive member in the transportation direction of the medium and is provided at an emission member side over the downstream end portion of the transmissive member.