Element for closing spaces of boats comprising: - a shaped frame, suitable for being associated perimetrically with said space, - a laminar surface that allows light to pass, associated with said shaped frame so as to face said space, - restraining means, associated with said shaped frame to open at least partially said space; - one or more locking devices of said laminar surface in a closed position of said space, associated with said shaped frame, - moving means of said locking devices, which connect together said locking devices, wherein said shaped frame comprises a rim suitable for being associated with said space and a watertight profile, associated on the outside with said rim through the interposition of an insulating gasket, wherein said moving means are suitable for releasing said shaped frame from said locking devices to open at least partially said space, said moving means also comprising a plurality of levers associated with said locking devices and one or more transmission rods (17a, 17b, 17c) operatively connected to said levers, said levers being also rotatably coupled with support bases (18a, 18b, 18c, 18d, 18e, 18f, 18g) fixed to a support structure and projecting towards the inside of a cabin of said boat, each defining a longitudinal rotation axis that represents the fulcrum of said levers, and wherein said restraining means define a longitudinal horizontal axis, about which said shaped frame rotates, and comprise a plurality of hinges aligned with each other along said longitudinal axis, arranged at the bottom edge of said shaped frame said support bases (18a, 18b, 18c, 18d, 18e, 18f, 18g) being uniformly distributed along said support structure and including: - a central base equipped with manoeuvring means available to the user to move said levers about said rotation axis, - a plurality of peripheral bases (18b, 18c, 18d, 18e), one for each of said locking devices, in pairs symmetrically arranged with respect to a vertical central axis of said laminar surface, the element being characterised in that the support bases further include - two connecting bases (18f, 18g) arranged symmetrically with respect to said vertical central axis and in that said central base and each of said peripheral bases (18b, 18c, 18d, 18e) comprise a single lever, whereas each of said connecting bases (18f, 18g) comprises a pair of levers (16', 16") arranged according to longitudinal directions perpendicular to one another. - a shaped frame, suitable for being associated perimetrically with said space, - a laminar surface that allows light to pass, associated with said shaped frame so as to face said space, - restraining means, associated with said shaped frame to open at least partially said space; - one or more locking devices of said laminar surface in a closed position of said space, associated with said shaped frame, - moving means of said locking devices, which connect together said locking devices, - a central base equipped with manoeuvring means available to the user to move said levers about said rotation axis, - a plurality of peripheral bases (18b, 18c, 18d, 18e), one for each of said locking devices, in pairs symmetrically arranged with respect to a vertical central axis of said laminar surface, - two connecting bases (18f, 18g) arranged symmetrically with respect to said vertical central axis