A single-bearing reel, comprising: a reel unit including a shaft support part; a spool shaft supported as a cantilever by the shaft support part; a support unit having a tubular shape, the support unit rotatable with respect to the spool shaft; a spool mounted to the support unit, the spool rotatable with respect to the spool shaft, a fishing line to be wound about an outer periphery of the spool; a first restriction member having an annular shape, the spool shaft penetrating through the first restriction member, the first restriction member at least partially mounted to an outer peripheral part of the support unit on a first end side of the support unit, the first restriction member restricting the spool from moving in an axial direction; a second restriction member having an annular shape, the spool shaft penetrating through the second restriction member, the second restriction member at least partially mounted to the outer peripheral part of the support unit on a second end side of the support unit, the second restriction member restricting the spool from moving in the axial direction; a pair of first seal members disposed on an outer peripheral surface of the support unit, one of the pair of first seal members sealing between the support unit and the first restriction member, the other of the pair of first seal members sealing between the support unit and the second restriction member; a second seal member sealing between the inner peripheral part of the first restriction member and an outer peripheral part of the shaft support part; and characterized by a third seal member sealing the inner peripheral part of the support unit from an inner peripheral part of the second restriction member. a reel unit including a shaft support part; a spool shaft supported as a cantilever by the shaft support part; a support unit having a tubular shape, the support unit rotatable with respect to the spool shaft; a spool mounted to the support unit, the spool rotatable with respect to the spool shaft, a fishing line to be wound about an outer periphery of the spool; a first restriction member having an annular shape, the spool shaft penetrating through the first restriction member, the first restriction member at least partially mounted to an outer peripheral part of the support unit on a first end side of the support unit, the first restriction member restricting the spool from moving in an axial direction; a second restriction member having an annular shape, the spool shaft penetrating through the second restriction member, the second restriction member at least partially mounted to the outer peripheral part of the support unit on a second end side of the support unit, the second restriction member restricting the spool from moving in the axial direction; a pair of first seal members disposed on an outer peripheral surface of the support unit, one of the pair of first seal members sealing between the support unit and the first restriction member, the other of the pair of first seal members sealing between the support unit and the second restriction member; a second seal member sealing between the inner peripheral part of the first restriction member and an outer peripheral part of the shaft support part; and characterized by a third seal member sealing the inner peripheral part of the support unit from an inner peripheral part of the second restriction member.