A device (1, 1', 1") for levelling and concomitantly spacing elements (E1, E2, E3, E4) of a flooring such as tiles, briquettes, plates or the like, comprising: - a base (2; 2'; 2") defining a resting surface (S, S', 5") that comprises a plurality of surface portions of said resting surface, said surface portions being adapted to receive in support respective portions (e1, e2, e3, e4) of said elements (E1, E2, E3, E4), so that said elements (E1, E2, E3, E4) can take an operative position corresponding to the support of the respective portion (e1; e2; e3; e4) of each of said elements (E1, E2, E3, E4) on a respective surface portion of said surface portions; - a stem, which takes a securing condition to said base (2; 2'; 2") and is configured to define an operative condition of a handle, in which said handle presses on said portions (e1, e2, e3, e4) of said elements (E1, E2, E3, E4) in contrast to the respective surface portions of said resting surface (S; S': S"), while said elements (E1, E2, E3, E4) take said operative position, so as to block said elements (E1, E2, E3, E4) in said operative position; wherein said stem comprises a connecting portion adapted to cooperate with said handle to define a connecting condition of said handle to said stem, and an impact body adapted to be hit by a user to cause, by breaking, the passage of said stem from said securing condition to a separation condition with respect to said base, said operative condition of the handle corresponding to said connecting condition of the handle to the stem; wherein said device is configured to keep said elements (E1, E2, E3, E4) spaced apart, while they take said operative position; said base (2; 2'; 2") comprising a weakened portion (21; 21'; 21"), which defines a narrowing of the resistant sectional area of said base, said securing condition of the stem to the base (2; 2'; 2") corresponding to a securing condition of said stem to said weakened portion (21; 21'; 21"), so that said weakened portion (21; 21'; 21") guides said breaking; said weakened portion being defined by a corresponding cavity (211; 211') which starts from the bottom face (222, 222') of the base (2, 2'); and characterized in that said weakened portion (21; 21'; 21") extends according to a respective axis or longitudinal direction and is such as to have a maximum perpendicular thickness at the central zone and a minimum perpendicular thickness at the opposite longitudinal ends (E, E) of said weakened portion. - a base (2; 2'; 2") defining a resting surface (S, S', 5") that comprises a plurality of surface portions of said resting surface, said surface portions being adapted to receive in support respective portions (e1, e2, e3, e4) of said elements (E1, E2, E3, E4), so that said elements (E1, E2, E3, E4) can take an operative position corresponding to the support of the respective portion (e1; e2; e3; e4) of each of said elements (E1, E2, E3, E4) on a respective surface portion of said surface portions; - a stem, which takes a securing condition to said base (2; 2'; 2") and is configured to define an operative condition of a handle, in which said handle presses on said portions (e1, e2, e3, e4) of said elements (E1, E2, E3, E4) in contrast to the respective surface portions of said resting surface (S; S': S"), while said elements (E1, E2, E3, E4) take said operative position, so as to block said elements (E1, E2, E3, E4) in said operative position; wherein said stem comprises a connecting portion adapted to cooperate with said handle to define a connecting condition of said handle to said stem, and an impact body adapted to be hit by a user to cause, by breaking, the passage of said stem from said securing condition to a separation condition with respect to said base, said operative condition of the handle corresponding to said connecting condition of the handle to the stem; wherein said device is configured to keep said elements (E1, E2, E3, E4) spaced apart, while they take said operative position; said base (2; 2'; 2") comprising a weakened portion (21; 21'; 21"), which defines a narrowing of the resistant sectional area of said base, said securing condition of the stem to the base (2; 2'; 2") corresponding to a securing condition of said stem to said weakened portion (21; 21'; 21"), so that said weakened portion (21; 21'; 21") guides said breaking; said weakened portion being defined by a corresponding cavity (211; 211') which starts from the bottom face (222, 222') of the base (2, 2'); and characterized in that said weakened portion (21; 21'; 21") extends according to a respective axis or longitudinal direction and is such as to have a maximum perpendicular thickness at the central zone and a minimum perpendicular thickness at the opposite longitudinal ends (E, E) of said weakened portion.