Wind turbine blade

A wind turbine blade, with a hollow blade body comprising an upper and a lower half shell and first and second elongated webs each extending in the lengthwise direction of the blade and being disposed between and connected to the upper and the lower half shell, with each web comprising an upper and a lower flange connecting the respective web to the respective half shell, and with the first and second webs being supported via respective first and second reinforcement structures relative to the respective half shell, wherein the respective first and second reinforcement structures are arranged between an outer and an inner layer of the upper and lower half shell and extend in the lengthwise direction of the blade, wherein the first and second reinforcement structures each comprise at least one stack composed of several pultruded composite strips comprising carbon fibers with the strips being fixed in resin, wherein at least one stiffening element extending along the first and second reinforcement structures over at least a part of their length comprising at least one stack composed of several glass fiber layers infused with the resin is arranged between the first and second reinforcement structures and sandwiched between the outer and inner layer of each of the upper and lower half shell, wherein at least one of the glass fiber layers of the at least one stiffening element extends into both stacks of the first and second reinforcement structures and is arranged between respective pairs of the strips in the first and second reinforcement structure to form a common glass fiber layer of the first reinforcement structure, the at least one stiffening element, and the second reinforcement structure.