A ratchet wrench comprising: a driving device including first and second sides (211, 212) spaced along a rotating axis, with a compartment extending from the first side through the second side, with the driving device further including a drive member received in the compartment and rotatable about the rotating axis, with the drive member including an end, with the end of the drive member adapted to drive a tool, with a ledge formed on an inner periphery of an end of the compartment at the second side, with the ledge including an abutment portion; a pressing rod extending into the drive member via the end of the compartment at the second side, with the pressing rod movable relative to the drive member along the rotating axis to control engagement with or detachment from the tool; and a dustproof ring (40; 40a) mounted between the ledge and the pressing rod, with the dustproof ring (40; 40a) including an outer side (401; 401a) and an inner side (402; 402a) surrounded by the outer side (401; 401a) and spaced from the outer side (401; 401a) in a radial direction perpendicular to the rotating axis, with the outer side (401; 401a) pressing against the abutment portion of the ledge, with the inner side (402; 402a) pressing against the pressing rod, with the outer side (401; 401a) including an outer periphery (41; 41a) pressing against the abutment portion of the ledge, with the inner side (402; 402a) including an inner periphery (42; 42a) spaced from the outer periphery (41; 41a) in the radial direction perpendicular to the rotating axis, with the inner periphery (42; 42a) including a lip (43; 43a) having an outer surface (432; 432a) pressing against the pressing rod. a driving device including first and second sides (211, 212) spaced along a rotating axis, with a compartment extending from the first side through the second side, with the driving device further including a drive member received in the compartment and rotatable about the rotating axis, with the drive member including an end, with the end of the drive member adapted to drive a tool, with a ledge formed on an inner periphery of an end of the compartment at the second side, with the ledge including an abutment portion; a pressing rod extending into the drive member via the end of the compartment at the second side, with the pressing rod movable relative to the drive member along the rotating axis to control engagement with or detachment from the tool; and a dustproof ring (40; 40a) mounted between the ledge and the pressing rod, with the dustproof ring (40; 40a) including an outer side (401; 401a) and an inner side (402; 402a) surrounded by the outer side (401; 401a) and spaced from the outer side (401; 401a) in a radial direction perpendicular to the rotating axis, with the outer side (401; 401a) pressing against the abutment portion of the ledge, with the inner side (402; 402a) pressing against the pressing rod, with the outer side (401; 401a) including an outer periphery (41; 41a) pressing against the abutment portion of the ledge, with the inner side (402; 402a) including an inner periphery (42; 42a) spaced from the outer periphery (41; 41a) in the radial direction perpendicular to the rotating axis, with the inner periphery (42; 42a) including a lip (43; 43a) having an outer surface (432; 432a) pressing against the pressing rod.