Leveling device suitable for being used by a user for laying on a plane and leveling at least two adjacent tiles P, P', comprising: - a support suitable for being disposed between the at least two tiles P, P' and comprising: ∘ a base suitable for being disposed under the at least two adjacent tiles P, P', ∘ an elongated body that extends orthogonally to the base and comprises first gripping means; - a pressing body with central longitudinal axis, suitable for being movably fastened to the support and comprising a bearing structure with a lower edge adapted to abut on at least one of the at least two tiles P, P'; a hole being formed in the bearing structure so as to receive the elongated body that can translate freely; the pressing body further comprising: - at least one fin (34, 36) fixed elastically to the bearing structure and adapted to be pressed by the user so as to be moved from a rest position when the fin is not pressed to a release position when the fin is pressed; - at least one arcuate body (50, 52) fixed elastically to the bearing structure, connected to the at least one fin (34, 36) and including second gripping means (54, 56); the first gripping means and the second gripping means (54, 56) being shaped in a homologous way so as to be coupled with one another so that when the elongated body is inserted in the hole and the at least one fin (34, 36) is in a rest position, the at least one arcuate body (50, 52) abuts on the elongated body and couples the first gripping means and the second gripping means (54, 56) to one another so as to avoid a free translation of the pressing body relative to the support, and so that when the elongated body is inserted in the hole and the at least one fin (34, 36) is in the release position, the at least one arcuate body (50, 52) is moved away from the elongated body and the first gripping means and the second gripping means (54, 56) are not coupled to one another so as to enable the pressing body to freely translate relative to the support; characterized by the fact that the first gripping means of the elongated body include a thread and the second gripping means of the at least one arcuate body (50, 52) include a counter-thread (54, 56), homologous to the thread, so that the elongated body can be screwed and unscrewed in the at least one arcuate body (50, 52). - a support suitable for being disposed between the at least two tiles P, P' and comprising: ∘ a base suitable for being disposed under the at least two adjacent tiles P, P', ∘ an elongated body that extends orthogonally to the base and comprises first gripping means; ∘ a base suitable for being disposed under the at least two adjacent tiles P, P', ∘ an elongated body that extends orthogonally to the base and comprises first gripping means; - a pressing body with central longitudinal axis, suitable for being movably fastened to the support and comprising a bearing structure with a lower edge adapted to abut on at least one of the at least two tiles P, P'; a hole being formed in the bearing structure so as to receive the elongated body that can translate freely; - at least one fin (34, 36) fixed elastically to the bearing structure and adapted to be pressed by the user so as to be moved from a rest position when the fin is not pressed to a release position when the fin is pressed; - at least one arcuate body (50, 52) fixed elastically to the bearing structure, connected to the at least one fin (34, 36) and including second gripping means (54, 56);