Disclosed is a method for manufacturing a spar for a blade for a wind power generator. The method for manufacturing a spar for a blade for a wind power generator according to one embodiment of the present invention includes a step of providing a mold with a cavity corresponding to the shape of a spar, a step of providing spar material including carbon and a thermosetting resin to the cavity, and a step of hardening the spar material by heating the spar material by applying an electric current to the spar material.
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