A low-bulkiness hinge for the closing of a closing member, such as a door, a shutter, a double-glazing glass or the like, anchored to a stationary support structure, such as a wall, a frame or a floor, the closing member or the stationary support structure defining a first plane ( π), the hinge being movable between an open position and a closed position, the hinge comprising: - a hinge body having a substantially plate shape to define a second plane (π '), said hinge body being anchorable to one of the closing member and the stationary support structure so as the first plane ( π) and the second plane ( π ') are coincident or parallel to each other, said hinge body internally comprising a working chamber with a front wall and a bottom wall faced thereto; - a pivot anchorable to the other of the closing member and the stationary support structure, defining a first longitudinal axis substantially parallel to said second plane ( π ') or lying thereon, said pivot and said hinge body being reciprocally coupled so as to rotate around said first axis between the opening and closing positions of the closing member; - a slider sliding in said working chamber along a second longitudinal axis substantially perpendicular to the first axis between a position distal to said bottom wall and a position proximal thereto; wherein said pivot further includes a cam element integrally rotatable therewith, said slider comprising an operative face interacting with said cam element so as upon the opening or the closing of the closing member the rotation of the former around said first axis corresponds to the sliding of the latter along said second axis from the distal to the proximal position, said working chamber further comprising at least one coil spring having a predetermined outer diameter ( Ø) interposed between said bottom wall of said working chamber and said slider to act on the latter so as to move it from the proximal to the distal position; wherein said working chamber includes first and second guiding means to respectively guide the at least one coil spring and said slider during their integral sliding along said second axis, said hinge body including an outer surface and an inner surface ( 10") comprising said front wall and bottom wall of said working chamber, said second guiding means comprising at least one first pair of shaped facing walls ( 14', 14") and a second pair of shaped facing walls (140', 140") of said working chamber interacting or in reciprocal contact with said slider, said hinge body being laterally open; characterized in that the hinge further comprises at least one closing element cooperating with the inner surface ( 10") of said hinge body to define said working chamber, said hinge body comprising said first pair of shaped facing walls ( 14', 14"), said at least one closing element comprising at least one of the shaped facing walls ( 140', 140") of said second pair, the walls of said first pair ( 14', 14") being substantially transversal with respect to the walls of said second pair ( 140', 140"). - a hinge body having a substantially plate shape to define a second plane (π '), said hinge body being anchorable to one of the closing member and the stationary support structure so as the first plane ( π) and the second plane ( π ') are coincident or parallel to each other, said hinge body internally comprising a working chamber with a front wall and a bottom wall faced thereto; - a pivot anchorable to the other of the closing member and the stationary support structure, defining a first longitudinal axis substantially parallel to said second plane ( π ') or lying thereon, said pivot and said hinge body being reciprocally coupled so as to rotate around said first axis between the opening and closing positions of the closing member; - a slider sliding in said working chamber along a second longitudinal axis substantially perpendicular to the first axis between a position distal to said bottom wall and a position proximal thereto;