Interferometer comprising - a light source (10; 110), - a first beam splitter (30.1; 125.1), which splits a beam emitted by the light source (10; 110) into at least one measurement beam and at least one reference beam, which span a splitting plane and wherein, up to unification at a unification location in a unification plane, the measurement beam propagates in a measurement arm and the reference beam propagates in a reference arm, wherein the unification plane is oriented parallel to the splitting beam, - a reference reflector (50; 150) arranged in the reference arm, wherein the reference beam strikes the reference reflector (50; 150) at least three times, - a measurement reflector (40; 140) arranged in the measurement arm and connectable to a measured object (41; 141), wherein the measurement beam strikes the measurement reflector (40; 140) at least three times, - a detection unit (60; 160), which renders capturable at least one distance signal in respect of the position of the measured object (41; 141) from the interfering measurement and reference beams (M, R) that are superimposed at the unification location, - at least two transparent plane plates (20, 30; 120, 125, 130), which are arranged successively in the beam propagation direction and parallel to one another in successive sequential fashion in the beam path between the light source (10; 110) and the detection unit (60; 160), wherein at least the measurement reflector (40; 140) is movable in relation to the plane plates (20, 30; 120, 125, 130) and the reference reflector (50; 150) along a measurement direction, wherein the measurement direction corresponds to the beam propagation direction between the plane plates (20, 30) and the measurement reflector (40; 140) and the plane plates (20, 30; 120, 125, 130) each comprise a plurality of optical elements which exert such an optical effect on the measurement beam and the reference beam that the measurement beam and the reference beam each propagate parallel to one another along the direction of the measurement and reference reflector (40, 40; 140, 150) and - wherein a plurality of reflectors and at least four imaging optical units for the measurement beam and the reference beam are embodied in the two plane plates (20, 30; 120, 125, 130) as optical elements and - wherein an offset of the measurement beam and of the reference beam from the splitting plane into an intermediate plane results in each case via two of the at least four imaging optical units, said intermediate plane being arranged between the splitting plane and the unification plane and being arranged parallel to these, and - wherein an offset of the measurement beam and of the reference beam from the intermediate plane into the unification plane results in each case via a further two of the at least four imaging optical units. - a light source (10; 110), - a first beam splitter (30.1; 125.1), which splits a beam emitted by the light source (10; 110) into at least one measurement beam and at least one reference beam, which span a splitting plane and wherein, up to unification at a unification location in a unification plane, the measurement beam propagates in a measurement arm and the reference beam propagates in a reference arm, wherein the unification plane is oriented parallel to the splitting beam, - a reference reflector (50; 150) arranged in the reference arm, wherein the reference beam strikes the reference reflector (50; 150) at least three times, - a measurement reflector (40; 140) arranged in the measurement arm and connectable to a measured object (41; 141), wherein the measurement beam strikes the measurement reflector (40; 140) at least three times, - a detection unit (60; 160), which renders capturable at least one distance signal in respect of the position of the measured object (41; 141) from the interfering measurement and reference beams (M, R) that are superimposed at the unification location, - at least two transparent plane plates (20, 30; 120, 125, 130), which are arranged successively in the beam propagation direction and parallel to one another in successive sequential fashion in the beam path between the light source (10; 110) and the detection unit (60; 160), wherein at least the measurement reflector (40; 140) is movable in relation to the plane plates (20, 30; 120, 125, 130) and the reference reflector (50; 150) along a measurement direction, wherein the measurement direction corresponds to the beam propagation direction between the plane plates (20, 30) and the measurement reflector (40; 140) and the plane plates (20, 30; 120, 125, 130) each comprise a plurality of optical elements which exert such an optical effect on the measurement beam and the reference beam that the measurement beam and the reference beam each propagate parallel to one another along the direction of the measurement and reference reflector (40, 40; 140, 150) and - wherein a plurality of reflectors and at least four imaging optical units for the measurement beam and the reference beam are embodied in the two plane plates (20, 30; 120, 125, 130) as optical elements and - wherein an offset of the measurement beam and of the reference beam from the splitting plane into an intermediate plane results in each case via two of the at least four imaging optical units, said intermediate plane being arranged between the splitting plane and the unification plane and being arranged parallel to these, and - wherein an offset of the measurement beam and of the reference beam from the intermediate plane into the unification plane results in each case via a further two of the at least four imaging optical units.