Conveying roller, web conveying device, and image forming apparatus capable of reducing scale of apparatus

A conveying roller comprising:

• a roller portion configured to rotate in contact with a web;
• a first air passage extending, in an axial direction of a rotation shaft of the roller portion, inside an outer peripheral portion of the roller portion and communicating with an outside at an end on a side of a first direction parallel to the axial direction;
• a plurality of second air passages arranged along the axial direction and each extending from the first air passage in a direction that intersects the first direction and communicating with an outside of the outer peripheral portion;
• and
• an air current generation portion provided in the first air passage and configured to generate an air current that flows in the plurality of second air passages toward the first air passage, wherein
• the first air passage communicates with the outside at an end on a side of a second direction opposite to the first direction, and
• the air current generation portion is a screw conveyor including a first screw portion configured to generate an air current that flows in the first direction on the side of the first direction of a central portion of the roller portion in the axial direction, and a second screw portion configured to generate an air current that flows in the second direction on the side of the second direction of the central portion of the roller portion in the axial direction.