The present invention relates to a line roller unit for a fishing line guide mechanism that guides a fishing line to a spool of a spinning reel. The line roller unit (25) comprises a line roller (4), a bearing (5) positioned on an inner circumferential surface of the line roller (4), and a cylindrical member (6) that has a holding unit for holding the bearing (5) and that is positioned on an inner circumferential surface of the bearing (5). The line roller unit (25) further comprises a first magnetic seal (7) that includes a first magnet (71) and a first holding member (72) that holds the first magnet (71). The first magnetic seal (7) forms a first magnetic circuit for holding a first magnetic fluid (70) positioned in a space between the cylindrical member (6) and the first holding member (72).本發明提供一種操作容易之導線輪組件及使用其之釣線導引機構。導線輪組件25具備導線輪4、軸承5、圓筒構件6及第1磁性密封件7。導線輪4於外周面具有導引釣線之導引部。軸承5設置於導線輪4之內周側。圓筒構件6具有保持軸承5之保持部。圓筒構件6設置於軸承5之內周側。第1磁性密封件7具有第1磁鐵71及保持第1磁鐵71之第1保持構件72。第1磁性密封件7於與圓筒構件6之間形成用以保持第1磁性流體70之第1磁路。第1磁性密封件7設置於導線輪4。
