A meshed state between a drive gear and a pinion gear can be maintained with high accuracy, and rigidity of a reel unit is increased. Entry of dust and water between a side opening portion and a lid member is prevented, and a risk of tangling of a fishing line is avoided. A fishing spinning reel is provided with a lid member (30) closing a side opening portion (13) provided at a side portion of a body (10) and rotatably supports a handle shaft (5) by using at least the lid member (30). The side opening portion (13) and the lid member (30) are circular in shape. A female screw portion is provided on an inner peripheral portion of the side opening portion (13), and a male screw portion is provided on an outer peripheral portion of the lid member and screwed into the female screw portion. There are provided a drive gear (6) driven to rotate via the handle shaft (5), a pinion gear (7a) meshed with the drive gear (6), a front bearing (52) rotatably supporting a front portion side of the pinion gear (7a), and a rear bearing (51) rotatably supporting a rear portion side of the pinion gear (7a).