A wind turbine rotor blade, with a longitudinal direction, at least one first rotor blade section with a first front side, at least one second rotor blade section with a second front side, a separation point between the first and second rotor blade sections (210, 220), wherein the first and second front sides (212, 222) abut against each other at the separation point, wherein the first front side has a plurality of first recesses, and the second front side has a plurality of second recesses, and a fastening unit, which is designed to fasten the first and second rotor blade sections (210, 220) to each other at the separation point, wherein the fastening unit has a plurality of first inserts made out of metal, which are arranged in the first recesses, and a plurality of second inserts made out of metal, which are arranged in the second recesses, wherein the first inserts each have a first end and a second end, wherein the second inserts each have a first end and a second end, wherein the first ends (311, 321) of the first and second inserts (310, 320) are each arranged at the separation point, wherein the fastening unit has a plurality of clamping units, which are suitable for bracing the first and second inserts (310, 320) against each other, wherein the respective first ends (311, 321) of the first and second inserts (310, 320) abut against each another or surround each other and are braced against each other in the braced state, wherein the clamping units are designed as bolts or threaded rods, wherein first ends of the clamping units are each fastened in or on the second insert, wherein second ends of the clamping units are each fastened in the first insert, wherein an adapter is arranged between the second ends of the clamping unit and the first insert, wherein the second ends of the clamping units are each fastened in or on the first insert by means of a nut, and a pretensioning is provided between the first ends (311, 321) of the first and second inserts (310, 320) by means of the nut,and a plurality of oblong holes/recesses (214, 314) in the first and second rotor blade sections (210, 220), wherein the ends of the clamping unit extend at least partially into the oblong holes (214, 314). a longitudinal direction, at least one first rotor blade section with a first front side, at least one second rotor blade section with a second front side, a separation point between the first and second rotor blade sections (210, 220), wherein the first and second front sides (212, 222) abut against each other at the separation point, wherein the first front side has a plurality of first recesses, and the second front side has a plurality of second recesses, and a fastening unit, which is designed to fasten the first and second rotor blade sections (210, 220) to each other at the separation point, wherein the fastening unit has a plurality of first inserts made out of metal, which are arranged in the first recesses, and a plurality of second inserts made out of metal, which are arranged in the second recesses, wherein the first inserts each have a first end and a second end, wherein the second inserts each have a first end and a second end, wherein the first ends (311, 321) of the first and second inserts (310, 320) are each arranged at the separation point, wherein the fastening unit has a plurality of clamping units, which are suitable for bracing the first and second inserts (310, 320) against each other, wherein the respective first ends (311, 321) of the first and second inserts (310, 320) abut against each another or surround each other and are braced against each other in the braced state, wherein the clamping units are designed as bolts or threaded rods, wherein first ends of the clamping units are each fastened in or on the second insert, wherein second ends of the clamping units are each fastened in the first insert, wherein an adapter is arranged between the second ends of the clamping unit and the first insert, wherein the second ends of the clamping units are each fastened in or on the first insert by means of a nut, and a pretensioning is provided between the first ends (311, 321) of the first and second inserts (310, 320) by means of the nut,and a plurality of oblong holes/recesses (214, 314) in the first and second rotor blade sections (210, 220), wherein the ends of the clamping unit extend at least partially into the oblong holes (214, 314).