A motorised drive device of a sliding window for a building, the window comprising at least: - a fixed frame, - a sash (3a, 3b), 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 (3a, 3b), the motorised drive device being configured to move the sash by sliding it relative to the fixed frame, - a fixed frame, - a sash (3a, 3b), 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.