Wind-turbine rotor blades

To improve the buckling strength against a load in the edge direction, close the safety factor of the buckling strength in the safety factor of the material strength, possible to further weight reduction. Skin material made of fiber-reinforced plastic (11), and shear web (15), the wind turbine rotor blade having a this shear web trailing edge sandwich material disposed on the trailing edge (18) than (15) (14) (5) comprising: a edge near the rear of the rear dorsal skin material positioned on the trailing edge (18) than the edge after the edge sandwich material (14) (11) or said trailing edge sandwich material the edge near the rear of the trailing edge lightweight core material (14) ventral skin material positioned on the trailing edge (18) than edge after (11) or said trailing edge sandwich material, reinforcing material ( It is connected via a 19).