A sunshade apparatus comprising: - a plurality of slats, each tilting about a tilt axis parallel to a longitudinal direction and having a first and a second end operatively coupled to a first and a second lateral guide, respectively, configured to guide the slats along a direction of movement, the direction of movement being transverse to the longitudinal direction; - a motor; - a lifting shaft, coupled to the motor; - a tilt pulley connected to the slats to rotate them about the respective tilt axes; - a spring clutch surrounding the lifting shaft and including a first locking end and a second locking end, each movable along a respective working trajectory, wherein the spring clutch is fixed to the tilt pulley to constrain it in rotation to the lifting shaft; - a detent system, including a first detent, configured to intercept the first locking end of the spring clutch in a first rotation direction of the lifting shaft, a second detent, configured to intercept the second locking end of the spring clutch in a second rotation direction of the lifting shaft, opposite to the first rotation direction, and a third detent configured to intercept the first locking end at an intermediate position along the working trajectory of the first locking end, upstream of the first detent in the first rotation direction of the lifting shaft, wherein said sunshade apparatus further comprises a release element, movable between an activated position, where said release element is in contact with the first locking end of the spring clutch to move it, and a deactivated position, where said release element it is clear of the first locking end, wherein the release element is configured to cause the first locking end to move away from the third detent to allow the first locking end to continue turning in the first rotation direction towards the first detent along the respective working trajectory. - a plurality of slats, each tilting about a tilt axis parallel to a longitudinal direction and having a first and a second end operatively coupled to a first and a second lateral guide, respectively, configured to guide the slats along a direction of movement, the direction of movement being transverse to the longitudinal direction; - a motor; - a lifting shaft, coupled to the motor; - a tilt pulley connected to the slats to rotate them about the respective tilt axes; - a spring clutch surrounding the lifting shaft and including a first locking end and a second locking end, each movable along a respective working trajectory, wherein the spring clutch is fixed to the tilt pulley to constrain it in rotation to the lifting shaft; - a detent system, including a first detent, configured to intercept the first locking end of the spring clutch in a first rotation direction of the lifting shaft, a second detent, configured to intercept the second locking end of the spring clutch in a second rotation direction of the lifting shaft, opposite to the first rotation direction, and a third detent configured to intercept the first locking end at an intermediate position along the working trajectory of the first locking end, upstream of the first detent in the first rotation direction of the lifting shaft,