The invention relates to a 3D adjustable concealed hinge comprising: a first symmetrical body (100) for securing to a frame, with a central opening (101) for coupling; and a second symmetrical body (102) for securing to a door, with an opening (103) for coupling, said symmetrical bodies being joined together by means of an opening-and-closing mechanism characterised by an upper arm (104) and a lower arm (105), which are joined together by means of a central adjustable screw (106). The upper arm is articulated by one part to the second symmetrical body and movable by means of a channel disposed in the first symmetrical body, the lower arm being arranged in an inverse manner, with the particularity that the two arms are formed by bent pieces, both arms being articulated together in correspondence with a crossing zone between same.
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