The present invention provides a double-bearing fishing line reel which can easily install or detach the substrate assembly. In a winding reel braking mechanism (25), through installing the substrate assembly (80) on a supporting component (81) and installing a disengaging-preventing component (83) composed of C-type ring between the substrate assembly (80) and the supporting component (81), the substrate assembly (80) and the supporting component (81) can rotate relatively but can not move relatively along the axial direction. Besides, because the substrate assembly (80) and the supporting component (81) form an integrated unit through the disengaging-preventing component (83) composed of C-type ring, the substrate assembly (80) integrated with the supporting component (81) can be detached through only detaching the supporting component (81).
