A pneumatic tool including: a casing unit having an air inlet passage; an air motor mounted in said casing unit, and including a cylinder wall that surrounds a motor axis and that defines an air chamber, said cylinder wall having first and second air ports (214, 215) that are in spatial communication with said air chamber; and a rotary valve mounted to said air motor and rotatable about a valve axis, said rotary valve having an opening and an intermediate passage that spatially intercommunicates said opening with said air inlet passage of said casing unit; wherein: said pneumatic tool further includes a turning unit including a ring member that surrounds and is rotatably mounted to said casing unit, said ring member being connected to said rotary valve, such that rotation of said ring member relative to said casing unit drives said rotary valve to rotate about the valve axis relative to said air motor among a first-end position, where said opening is in spatial communication with said first air port and is clear of obstructions, a second-end position, where said opening is in spatial communication with said second air port and is clear of obstructions, and at least one in-between position, where said opening is in spatial communication with one of said first and second air ports (214, 215) and is partially blocked; characterized in that: the valve axis is parallel to and spaced apart from the motor axis and further said casing unit includes a front casing and a rear casing that are arranged along the motor axis; said rear casing further has a front end portion connected to said front casing; and said ring member of said turning unit surrounds said front end portion and is disposed between said front and rear casings (11, 12) of said casing unit. a casing unit having an air inlet passage; an air motor mounted in said casing unit, and including a cylinder wall that surrounds a motor axis and that defines an air chamber, said cylinder wall having first and second air ports (214, 215) that are in spatial communication with said air chamber; and a rotary valve mounted to said air motor and rotatable about a valve axis, said rotary valve having an opening and an intermediate passage that spatially intercommunicates said opening with said air inlet passage of said casing unit; wherein: said pneumatic tool further includes a turning unit including a ring member that surrounds and is rotatably mounted to said casing unit, said ring member being connected to said rotary valve, such that rotation of said ring member relative to said casing unit drives said rotary valve to rotate about the valve axis relative to said air motor among a first-end position, where said opening is in spatial communication with said first air port and is clear of obstructions, a second-end position, where said opening is in spatial communication with said second air port and is clear of obstructions, and at least one in-between position, where said opening is in spatial communication with one of said first and second air ports (214, 215) and is partially blocked; characterized in that: the valve axis is parallel to and spaced apart from the motor axis and further said casing unit includes a front casing and a rear casing that are arranged along the motor axis; said rear casing further has a front end portion connected to said front casing; and said ring member of said turning unit surrounds said front end portion and is disposed between said front and rear casings (11, 12) of said casing unit.