A telescopic handle for a suitcase; the telescopic handle comprises: a fixed plate, which is designed to be fixed to a rear wall of the suitcase; a movable plate, which is coupled to the fixed plate in a sliding manner so as to slide relative to the fixed plate along a sliding direction and between a retracted position and an extended position; a grip, which is fixed to an upper wall of the movable plate, is "U"-shaped, and comprises a handle, which is connected to the movable plate by means of two connection crosspieces, which are arranged at the opposite ends of the handle; and a locking system, which is designed to lock the sliding of the movable plate relative to the fixed plate when it reaches the extended position and comprises a control lever, which is arranged inside the grip between the two connection crosspieces; wherein the locking system comprises at least two stop seats, which are obtained in the fixed plate and define the retracted position and the extended position, respectively; wherein the locking system comprises a stop pawl, which is supported by the movable plate, is designed to be inserted into each stop seat, and is movable along a stop direction, which is perpendicular to the sliding direction; wherein the locking system comprises at least one elastic element, which pushes the stop pawl towards the stop seats; wherein the locking system comprises a transmission line, which transmits the movement of the control lever to the stop pawl so as to push the stop pawl away from the stop seats, thus compressing the elastic element; wherein the transmission line comprises an idler rod having an upper end, which receives the motion from the control lever, and a lower end, which transmits the motion to the stop pawl; wherein the transmission line comprises a slider, which is integral to the lower end of the idler rod and transmits the motion to the stop pawl by means of a coupling with inclined planes; the telescopic handle is characterized in that: the control lever is hinged to the two connection crosspieces so as to rotate around a rotation axis, which is perpendicular to the sliding direction; the idler rod comprises an initial pin, which is rigid, has a straight shape, and is mechanically coupled to the control lever; the idler rod comprises a final stem, which is rigid, has a straight shape, and is mechanically coupled to the slider; and the idler rod comprises an intermediate portion, which has a curved shape and is interposed between the initial pin and the final stem. a fixed plate, which is designed to be fixed to a rear wall of the suitcase; a movable plate, which is coupled to the fixed plate in a sliding manner so as to slide relative to the fixed plate along a sliding direction and between a retracted position and an extended position; a grip, which is fixed to an upper wall of the movable plate, is "U"-shaped, and comprises a handle, which is connected to the movable plate by means of two connection crosspieces, which are arranged at the opposite ends of the handle; and a locking system, which is designed to lock the sliding of the movable plate relative to the fixed plate when it reaches the extended position and comprises a control lever, which is arranged inside the grip between the two connection crosspieces; wherein the locking system comprises at least two stop seats, which are obtained in the fixed plate and define the retracted position and the extended position, respectively; wherein the locking system comprises a stop pawl, which is supported by the movable plate, is designed to be inserted into each stop seat, and is movable along a stop direction, which is perpendicular to the sliding direction; wherein the locking system comprises at least one elastic element, which pushes the stop pawl towards the stop seats; wherein the locking system comprises a transmission line, which transmits the movement of the control lever to the stop pawl so as to push the stop pawl away from the stop seats, thus compressing the elastic element; wherein the transmission line comprises an idler rod having an upper end, which receives the motion from the control lever, and a lower end, which transmits the motion to the stop pawl; wherein the transmission line comprises a slider, which is integral to the lower end of the idler rod and transmits the motion to the stop pawl by means of a coupling with inclined planes; the telescopic handle is characterized in that: the control lever is hinged to the two connection crosspieces so as to rotate around a rotation axis, which is perpendicular to the sliding direction; the idler rod comprises an initial pin, which is rigid, has a straight shape, and is mechanically coupled to the control lever; the idler rod comprises a final stem, which is rigid, has a straight shape, and is mechanically coupled to the slider; and the idler rod comprises an intermediate portion, which has a curved shape and is interposed between the initial pin and the final stem. the control lever is hinged to the two connection crosspieces so as to rotate around a rotation axis, which is perpendicular to the sliding direction; the idler rod comprises an initial pin, which is rigid, has a straight shape, and is mechanically coupled to the control lever; the idler rod comprises a final stem, which is rigid, has a straight shape, and is mechanically coupled to the slider; and the idler rod comprises an intermediate portion, which has a curved shape and is interposed between the initial pin and the final stem.