A medium transport apparatus includes a main body that is switchable between a first posture and a second posture and a rotatable route-forming member that forms an exterior of a turning route. The route-forming member couples a first transport route to a second transport route when the main body has the first posture and couples the first transport route to a third transport route when the main body has the second posture. The medium transport apparatus further includes a transport route switching section having a switching member that engages with both the body support and the route-forming member. In response to switching between the first posture and the second posture of the main body, engagement of the switching member with the main-body support changes to rotate the route-forming member and to switch the medium transport route to which the first transport route is coupled.

A document reading device includes: an image capturing member that captures an image of a document; a placement portion that is disposed below the image capturing member and that has a boundary line between multiple surfaces at a position at which the boundary line is covered by the document when the document has a maximum size that the image capturing member is capable of imaging and the document is placed on the placement portion; and a document reading member that reads the document that is placed on the placement portion.