Chair structure

The present invention concerns a chair structure (10) comprising a base (1), a seat (13), a connection element (60) for connecting said base (1) to said seat (13), said base being able to be attached in at least one point (Pl) to a support plane, first connection means (81) for connecting a first end (80) of said connection element (60) to said base (1), said first connection means (81) being able to rotate with respect to said base to allow said connection element to rotate about a first axis (X) that extends in a direction substantially parallel to said support plane, so that said seat (13) passes between a first operative position (Ql), in which said seat (13) is suitable for receiving a user in an ergonomic fashion, and a second operative position (Q2). The characteristic of the chair structure (10) is that said base (1) is able to rotate with respect to said support plane about a second axis (Yl) that extends in a direction transversal to said support plane, to pass between a first working configuration (Cl) and a second entry or exit configuration.