NOVELTY - The device (10) has equally spaced floats (12) mutually connected with each other. Each float includes a conversion unit to convert oscillating movement of an articulated arm (16) associated with movement of a generation mechanism of energy carried by each float. A connection structure of the float is placed above a water line of the float. Each end of the arm is guidably connected in rotation with a transverse shaft (26) rotatably mounted on the float corresponding to its axis. The shaft includes an input element for inputting the oscillation movement to the mechanism.    USE - Device for producing energy from a movement of waves in sea. Uses include but are not limited to a electrical energy, a mechanical energy, a hydraulic or pneumatic energy to be used on site i.e. oil platform, and to be transferred to a distribution network, or a supply terminal of gasification or autonomous systems, or to recharge electric batteries of ships and for production of hydrogen by fractionation system of seawater, energy used for actuating sea water desalination plant, pumping of water or liquid, and for offshore oil rig hydrocarbon extraction.    ADVANTAGE - The connection structure of the float is placed above the water line of the float, where each end of the arm is guidably connected in rotation with the transverse shaft mounted rotating on the float corresponding to its axis, and the shaft includes the input element for inputting the oscillation movement to the generation mechanism so as to convert oscillation of the arm into the rotation movement without requiring presence of additional projecting elements relative to the axis of the traverse shaft, and hence making the device to be simple and compact. The device is inexpensive to manufacture and maintain.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic side elevational view of a float of a device for producing energy from movement of waves, under calm sea condition.    Device for producing energy from movement of waves (10)    Equally spaced floats (12)    Articulated arm (16)    Transverse shaft (26)    Upright (28)