Concealed door hinge for pivotably mounting a door leaf on a door frame, comprising - a first hinge part which can be installed on the door frame, - a second hinge part which can be installed on the door leaf, - a multi-axis joint which connects the first hinge part and the second hinge part to each other, - wherein the first hinge part has a first housing which can be inserted in the door frame, - wherein the second hinge part has a second housing which can be inserted in the narrow side of the door leaf, - wherein each of the housings (5, 6) has two housing bodies (51, 52, 61, 62) arranged one inside the other, - wherein the housing bodies (51, 52, 61, 62) of at least one of the housings (5, 6) are adjustable relative to each other in the installed state of the concealed door hinge, characterized in that - the inner housing body (52, 62) is fastened to the outer housing body (51, 61) in a loosenable manner by adjusting screws, - wherein at least one spacer can be fastened between a rear plate (512, 612) of the outer housing body (51, 61) and a rear plate (522, 622) of the inner housing body (52, 62), by means of the adjusting screws, in order to adjust the inner housing body (52, 62) relative to the outer housing body (51, 61) in the direction of installation (z) of the housing (5, 6), - wherein, in the loosened state of the adjusting screws, the inner housing body of the first hinge part is displaceable relative to the outer housing body, in a direction perpendicular to an axis of rotation of the joint and to the direction of insertion (z) of the housing, along elongate holes in the rear plate of the outer housing body of the first hinge part. - a first hinge part which can be installed on the door frame, - a second hinge part which can be installed on the door leaf, - a multi-axis joint which connects the first hinge part and the second hinge part to each other, - wherein the first hinge part has a first housing which can be inserted in the door frame, - wherein the second hinge part has a second housing which can be inserted in the narrow side of the door leaf, - wherein each of the housings (5, 6) has two housing bodies (51, 52, 61, 62) arranged one inside the other, - wherein the housing bodies (51, 52, 61, 62) of at least one of the housings (5, 6) are adjustable relative to each other in the installed state of the concealed door hinge, - the inner housing body (52, 62) is fastened to the outer housing body (51, 61) in a loosenable manner by adjusting screws, - wherein at least one spacer can be fastened between a rear plate (512, 612) of the outer housing body (51, 61) and a rear plate (522, 622) of the inner housing body (52, 62), by means of the adjusting screws, in order to adjust the inner housing body (52, 62) relative to the outer housing body (51, 61) in the direction of installation (z) of the housing (5, 6), - wherein, in the loosened state of the adjusting screws, the inner housing body of the first hinge part is displaceable relative to the outer housing body, in a direction perpendicular to an axis of rotation of the joint and to the direction of insertion (z) of the housing, along elongate holes in the rear plate of the outer housing body of the first hinge part.