A concealed hinge for the rotatable movement of a closing element, such as a door, a window, a door or the like, which is fixed to a stationary support structure, such as a wall, a floor, a frame or the like, the hinge comprising: - a fixed hinge body anchorable to the stationary support structure; - a movable hinge body anchorable to the closing element; - a connecting assembly for mutual connection of said fixed hinge body and movable hinge body in such a manner that the latter rotates with respect to the former about a first longitudinal axis between an open position and a closed position; wherein one of said fixed hinge body or said movable hinge body includes a first box-shaped element concealedly insertable within one of the closing element and the stationary support structure, the other of said fixed hinge body or said movable hinge body comprising a second box-shaped element concealedly insertable within the other of the closing element and the stationary support structure, the one of the first box-shaped element and the second box-shaped element which is insertable within the stationary support structure defining a second axis substantantally perpendicular to the first axis; wherein said connecting assembly protrudes from said first box-shaped element in the open position of the movable element, said first box-shaped element being susceptible to internally contain said connecting assembly in the closed position of the movable element; wherein said second box-shaped element includes a first outer element anchored to said other of the closing element and the stationary support structure and a second element placed within the former, said second inner element being movable with respect to the first outer element, means being provided for blocking/unblocking the movement of the former with respect to the latter by mutual engagement, said first outer element including first guide means for guiding the sliding of said second inner element along a first direction ( d) substantially perpendicular to said first axis and said second axis; wherein said first outer element includes second guide means for guiding the sliding of said second inner element along a second direction ( d') substantially parallel to said first axis and perpendicular to both said second axis and said first direction ( d); characterized in that said second guide means include two or more adjusting screws ( 128', 128") placed on opposite sides of said second inner element with respect to a median plane substantially perpendicular to said second direction ( d'), said adjusting screws ( 128', 128") being inserted through said first outer element to interact with said second inner element, in such a manner that they move said second inner element along said second longitudinal direction ( d') and that the lower one of said adjusting screws ( 128', 128") supports the second inner element during its sliding along the first direction ( d) by means of said first guide means; wherein said first outer element and/or said second inner element includes two or more front apertures ( 131', 131") in correspondences of said adjusting screws ( 128', 128") to allow an operator to access on the latter when the second box-shaped element is concealedly inserted within said other of the closing element and the stationary support structure; wherein each of said adjusting screws ( 128', 128") includes one or more seats ( 132', 132") to be engaged by a suitable adjusting tool operated by an operator through said front apertures ( 131', 131"). - a fixed hinge body anchorable to the stationary support structure; - a movable hinge body anchorable to the closing element; - a connecting assembly for mutual connection of said fixed hinge body and movable hinge body in such a manner that the latter rotates with respect to the former about a first longitudinal axis between an open position and a closed position;