Invisible hinge for rotatably connecting a movable member to a fixed frame, which comprises: - a first hinge body delimiting a corresponding first containment seat, intended to be embedded within a corresponding first cavity obtained in said movable member; - a second hinge body delimiting a corresponding second containment seat, intended to be embedded within a corresponding second cavity obtained in said fixed frame; - means for articulation, which rotatably connect said first hinge body and said second hinge body, between a closed position in which said first and second containment seat (20, 30) are opposite each other with the first internal wall and the first external wall of said first hinge body respectively substantially side-by-side the second internal wall and the second external wall of said second hinge body and oriented towards same directions (V1, V2); and an open position, in which said first and second containment seat (20, 30) are directed in a common direction with the first external wall of said first hinge body facing the second external wall of said second hinge body; wherein said articulation means comprise: - at least one first panel connecting rod, which is housed within the first containment seat of said first hinge body and is pivoted at a first end thereof to said first internal wall of the latter and at its second end to a first termination of at least one first curved lever, which is pivoted at its second termination to the second external wall of said second hinge body; - at least one second frame connecting rod, which is housed within the second containment seat of said second hinge body and is pivoted at a third end thereof to the second external wall of the latter and at a fourth end to a third termination of at least one second curved lever, which is pivoted at a fourth termination to the first external wall of said first hinge body. - a first hinge body delimiting a corresponding first containment seat, intended to be embedded within a corresponding first cavity obtained in said movable member; - a second hinge body delimiting a corresponding second containment seat, intended to be embedded within a corresponding second cavity obtained in said fixed frame; - means for articulation, which rotatably connect said first hinge body and said second hinge body, between a closed position in which said first and second containment seat (20, 30) are opposite each other with the first internal wall and the first external wall of said first hinge body respectively substantially side-by-side the second internal wall and the second external wall of said second hinge body and oriented towards same directions (V1, V2); and an open position, in which said first and second containment seat (20, 30) are directed in a common direction with the first external wall of said first hinge body facing the second external wall of said second hinge body; - at least one first panel connecting rod, which is housed within the first containment seat of said first hinge body and is pivoted at a first end thereof to said first internal wall of the latter and at its second end to a first termination of at least one first curved lever, which is pivoted at its second termination to the second external wall of said second hinge body; - at least one second frame connecting rod, which is housed within the second containment seat of said second hinge body and is pivoted at a third end thereof to the second external wall of the latter and at a fourth end to a third termination of at least one second curved lever, which is pivoted at a fourth termination to the first external wall of said first hinge body.