A web conveying device includes a roller portion, a first air passage, a second air passage, and an air current generation portion. The roller portion rotates in contact with a web. The first air passage extends in an axial direction of a rotation shaft of the roller portion inside an outer peripheral portion of the roller portion and communicates with an outside at an end on a side of a first direction parallel to the axial direction. The second air passage extends from the first air passage in a direction that forms an obtuse angle with respect to the first direction and communicates with the outside of the outer peripheral portion. The air current generation portion generates an air current that flows in the first air passage in the first direction.