Abstract: The invention relates to an armchair tablet hinge system. According to the invention, the tablet (1) is mounted to an armrest of the armchair by means of a support (4), said support containing a hollow shaft (5). The end of the hollow shaft is provided with a head (6) to which the tablet (1) is articulated by means of a cam-shaped element (7). In addition, rod (10) is housed in the aforementioned shaft (5) and is pushed against the cam-shaped element (7) by means of a spring (11). Moreover, the end of the rod (10) can be inserted into a notch (13) in the cam (7) in order provisionally to block the rotation of the tablet (1).