Wind turbine blade

A wind turbine blade having a lightning protection function, comprising:

• an outer shell;
• a spar arranged in a space inside the outer shell and extends in a longitudinal direction of the blade;
• a spar cap which is formed by a carbon-fiber plastic laminated member disposed on a blade root side and a glass-fiber plastic laminated member disposed on a blade tip side that are connected together, said spar cap supporting the spar to the outer shell;
• and
• a lightning protection unit comprising:
• a receptor for receiving lightning which is provided in the outer shell on a side where the glass-fiber plastic laminated member is arranged;
• a down conductor which directs lightning current received by the receptor into at least one of ground or water;
• and
• a conductive metal member which covers the outer shell on the blade root side where the carbon fiber plastic laminated member is arranged;
• and
• a base plate configured to support the receptor and disposed in a space surrounded by the outer shell on the blade tip side,
• wherein the receptor is attached to the outer shell on the blade tip side in such a manner that the receptor is exposed at an outer surface of the outer shell on the blade tip side, and
• wherein the receptor is electrically connected to the down conductor via the base plate, the down conductor extends from the blade tip side toward the base root side so as to direct the lightning current received by the receptor toward the ground or water, and the conductive metal member is electrically connected to the down conductor or the base plate;
• and
• wherein the down conductor is attached on a surface of a shear web via a fixing member in a region where the shear web exists, whereas the down conductor is provided along an inner surface of the outer shell.