A device for attaching a tablet computer to the rear-side of a motor vehicle seat has a support (5, 50, 50′, 50″, 59, 150) for receiving the tablet computer (6, 60). The support (5, 50, 50′, 50″, 59, 150) can be moved between a first position in which the screen (6a, 60a, 60a′, 60a″, 160a) of the tablet computer (6, 60) is arranged on the side opposite the vehicle seat part (1a, 1b, 1c, 1c′, 1c″, 10a, 10a′, 10b, 10c) and aligned essentially vertically and a second user position in which the screen (6a, 60a, 60a′, 60a″, 160a) is oriented upwards and essentially horizontally or oblique.