The invention relates to a modular piece of furniture (1) comprising: - at least one modular element (2) comprising perforated plates (5, 6, 7), - at least one fastening device (4) being housed in one of the orifices (8) of the modular element (2), the fastening device (4) comprising a cylindrical body (12), an actuating element (15), and retaining means (16), the actuating element (15) cooperating with the retaining means (16) and being configured such that, upon actuating the actuating element (15), the retaining means (16) change from an unlocked configuration to a locked configuration and vice versa, wherein in the unlocked configuration, the retaining means (16) are located at a distance from an internal surface of said orifice (8), and in the locked configuration, a portion of the retaining means (16) protrudes in a radial direction from the cylindrical body (12),the retaining means (16) being in contact with the internal surface of said orifice (8) and exerting a force against the internal surface of said orifice (8). Figure for the abbreviation: 3,