To provide a ridge ventilation member, which has excellent ventilation efficiency and into which rainwater or the like, however, does not infiltrates.

Airways 14 for ventilation blocks 13 and 13 are formed in a labyrinthine shape in the ridge ventilation member 11 in which the ventilation blocks 13 and 13 are stuck on both sides of the underside of a cover sheet 12 in which a folded groove 12A is formed at a central section, and the infiltration of rainwater or the like is interrupted by labyrinthine properties even when the airways 14 are widened and ventilation efficiency is improved.