A conveyor includes a rotation shaft and a plurality of convey members provided along an axial direction of the rotation shaft, wherein at least one part of the plurality of convey members is an arc convey member that includes: an arc part having an outer periphery that forms an arc forming a part of a spiral so that an angle between two perpendiculars extended from two ends of the arc is smaller than 360°; and a support part that supports the arc part, with the outer periphery of the arc part inclined to the axial direction of the rotation shaft.