The reel unit has a first side plate made of a magnesium alloy and a first side cover made of an aluminum alloy mounted to a side of the first side plate. The first side plate has an opening and a plurality of plate-like members made of an aluminum alloy mounted to the first side plate around the opening. The first side cover has an opening, and a brake case made of an aluminum alloy turnably mounted in the opening. Aluminum alloy protrusions are formed on an outer peripheral side of the brake case. The first side cover is secured to the first side plat by causing the protrusions formed on the brake case to engage in a bayonet fashion with the plate-like members separately attached to the first side plate.不需將捲線器整體大型化,就可以將側蓋確實地固定在側板。捲線器本體(1),是具有:鎂合金製的第1側板(5a)、及被裝設於第1側板(5a)的側方的鋁合金製的第1側蓋(6a)。在第1側板(5a)的開口部(5c)的周圍,具有由別體被裝設的鋁合金製的板狀部(80)。在第1側蓋(6a)的開口部(6d)中,鋁合金製的制動器殼(65)是可轉動地被裝設。在制動器殼(65)的外周部,形成有鋁合金製的突出部(65a)。在此,將形成於制動器殼(65)的鋁合金製的突出部(65a),藉由卡口卡合在由別體被安裝在鎂合金製的第1側板(5a)的鋁合金製的板狀部(80),將第1側蓋(6a)固定在第1側板(5a)。1...捲線器本體5a...第1側板5d...框構件5f...第1限制部5g...第2限制部65...制動器殼65a...突出部65b...傾斜部80...板狀部90...螺絲構件
