To release the heat accumulated on a roof effectively and improve the construction property.

In a ridge 1 provided in a top part of a roof, the ridge 1 is constituted by stacking ridge tiles 6a, 6b, 7a, 7b and decoration tile support means 10a, 10b, 11a, 11b for supporting the ridge tiles alternately, and a ventilation hole passing through the ridge tile support means 10a, 10b, 11a, 11b in the vertical direction is formed in the ridge tile support means 10a, 10b, 11a, 11b. A support means groove which communicates with the ventilation hole and is directed toward an outer side of the ridge 1 is formed in at least one ridge tile support means 10a, 10b, 11a, 11b among a plurality of ridge tile support means 10a, 10b, 11a, 11b, a tile groove directed from an inner side toward the outer side of the ridge is formed on a lower face of at least one decoration title among a plurality of ridge tiles 6a, 6b, 7a, 7b, and an air rising passage 34 formed by communicating a plurality of ventilation holes and a ventilation passage 36 formed by the support means groove and the tile groove are mutually communicated.