Securing element, particularly suitable for use with tablet-arm chairs

Fixing element (1), of special application in desk-chairs (10) that comprise a writing tablet (11) provided at the bottom with a tubular support (12) for its union and fastening to the chair, characterized in that it comprises: - a main part (20) that has two through openings (21, 22) inside, a first opening (21) intended to receive and house the tubular support (12) of the writing tablet (11); and a second opening (22) dimensionally adapted to be coupled to one of the legs (13) of the chair, also comprising a vertical stem (23), and - a folding part (30) linked to the main part (20) through of its stem (23), arranged in a position coinciding with the second opening (22), and being adapted to open and close allowing the release of the fixing element (1) with respect to the leg (13) of the chair.