A motorised drive device of a sliding window for a building, the window comprising at least: - a fixed frame , - a sash , the motorised drive device being configured to move the sash by sliding it relative to the fixed frame , the motorised drive device comprising at least: - an electromechanical actuator , the electromechanical actuator comprising at least one electric motor , - a flexible element , - a shuttle , the shuttle being attached to the flexible element , and - a drive arm , the drive arm being configured to be connected, on the one hand, to a frame of the sash of the window and, on the other hand, to the flexible element , the drive arm and the flexible element being configured to displace the sash relative to the fixed frame of the window , when the electromechanical actuator is electrically activated, the drive arm being configured to be connected to the flexible element by means of the shuttle , the shuttle comprising at least: - a first part , the first part comprising at least one protruding element , and - a second part , the second part comprising at least one housing , the protruding element of the first part being inserted into the housing of the second part , in an assembled configuration of the shuttle , characterised in that the flexible element is immobilised between the protruding element of the first part and the housing of the second part , following the insertion of the protruding element of the first part into the housing of the second part . the window comprising at least: - a fixed frame , - a sash , the motorised drive device being configured to move the sash by sliding it relative to the fixed frame , - a fixed frame , - a sash , the motorised drive device being configured to move the sash by sliding it relative to the fixed frame , the motorised drive device comprising at least: - an electromechanical actuator , the electromechanical actuator comprising at least one electric motor , - a flexible element , - a shuttle , the shuttle being attached to the flexible element , and - a drive arm , the drive arm being configured to be connected, on the one hand, to a frame of the sash of the window and, on the other hand, to the flexible element , the drive arm and the flexible element being configured to displace the sash relative to the fixed frame of the window , when the electromechanical actuator is electrically activated, the drive arm being configured to be connected to the flexible element by means of the shuttle , - an electromechanical actuator , the electromechanical actuator comprising at least one electric motor , - a flexible element , - a shuttle , the shuttle being attached to the flexible element , and - a drive arm , the drive arm being configured to be connected, on the one hand, to a frame of the sash of the window and, on the other hand, to the flexible element , the drive arm and the flexible element being configured to displace the sash relative to the fixed frame of the window , when the electromechanical actuator is electrically activated, the drive arm being configured to be connected to the flexible element by means of the shuttle , the shuttle comprising at least: - a first part , the first part comprising at least one protruding element , and - a second part , the second part comprising at least one housing , - a first part , the first part comprising at least one protruding element , and - a second part , the second part comprising at least one housing , the protruding element of the first part being inserted into the housing of the second part , in an assembled configuration of the shuttle , characterised in that the flexible element is immobilised between the protruding element of the first part and the housing of the second part , following the insertion of the protruding element of the first part into the housing of the second part . <EOS>