A handle shaft support structure rotatably supports a handle shaft on a reel unit, and includes a boss portion, a roller type one-way clutch, and a pair of seal members. The boss portion is a cylindrical member that is detachably mounted to the reel unit. The one-way clutch includes an outer ring that is non-rotatably coupled to the inner peripheral surface of the boss portion, an inner ring that is arranged on the outer periphery of the handle shaft and is integrally rotatably coupled to the handle shaft, and rolling elements that are arranged between the outer and inner rings. The one-way clutch supports the handle shaft rotatably only in one direction. The pair of seal members are members that are arranged on the both sides of the one-way clutch to seal the one-way clutch.本發明之課題在於針對藉由滾子型單向離合器支撐操作桿軸的構造,儘可能地抑制成本上昇,且抑制異物侵入。用以解決課題之手段為,操作桿軸支撐構造(39)為用來將操作桿軸(30)可自由旋轉地支撐於捲線器本體(1)的構造,具備有第2轂部(7c)、滾子型單向離合器(89)、及一對密封構件(91)。第2轂部(7c)為可裝卸地固定於捲線器本體者。單向離合器為使操作桿軸僅可朝一方向旋轉地支撐,具有不能旋轉地連結於第2轂部的內周面之外輪、配置於操作桿軸的外周,可一體旋轉地連結於操作桿軸之內輪、及配置於外輪與內輪之間的轉胴體。一對密封構件為配置於單向離合器的兩側方,將單向離合器予以密封之構件。1‧‧‧捲線器本體2‧‧‧操作手把5‧‧‧框架7c‧‧‧第2轂部(旋轉支撐構件的一例)7e‧‧‧突緣部7f‧‧‧筒狀部12‧‧‧捲筒89‧‧‧單向離合器91‧‧‧密封構件92‧‧‧密封部分92a‧‧‧裝設部92b‧‧‧圓板部92c‧‧‧唇部93‧‧‧後備用部分94‧‧‧螺絲構件
