A determination apparatus includes a first transportation guide, disposed on one side of a conveyance path through which a medium travels when being transported, on which a first transportation surface is formed facing the conveyance path. A sensor, on which a reading surface that reads a state of the medium, is provided closer to a side of the first transportation guide than the conveyance path. A second transportation guide, disposed on another side of the conveyance path facing the first transportation guide across the path, on which a second transportation surface is formed facing the path, on which a space through which the medium is transported, is formed between the first and second transportation guides, and on which a bend part is formed, at a portion facing the reading surface, bent in a direction separating from the reading surface more than a portion not facing the reading surface.