An instrument panel integrated defroster duct includes a defroster duct having a plurality of integrally formed ducts that guide an air stream into a vehicle compartment, an instrument panel covering the upper side of the defroster duct, a welding part having a protrusion formed at the defroster duct by a predetermined length, the welding part integrally forming a joining section between the instrument panel and the defroster duct by vibration welding, and a connecting part integrally connecting an uneven section of the defroster duct to the instrument panel using a screw.
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