To eliminate various hindrance such as problems of having a danger of falling as it is or having the possibility of scattering since a broken roof tile or a roof tile is not regulated when the roof tile is broken down, or when a fastener such as a support member is damaged in a conventional ridge structure, problems of a scene, flapping of a net, the replacement of the roof tile, and maintenance in covering the whole roof though there is the constitution for covering the whole roof with the net, and problems of a tear of the net by snow, clogging by dust, damage of the net by an animal, for example, a monkey in mountainous region, and leaving of the dead body of a bird.

This ridge structure is composed of a ridge beam supported by a ridge beam support member of the ridge, one or several various roof tiles arranged on the ridge beam and the ridge beam support member via a roof tile support member, and the net locked on either one member of the ridge beam, and has the safety net constituted so as to cover at least a side surface of the other one or several roof tiles positioned on the roof tile after reaching the side surface of the roof tile by inserting the net between the roof tiles, and can protect the ridge from a disaster such as a typhoon and an earthquake, and fragility of roofing earth and a wire, and can prevent falling of the various roof tiles by breakage of tiles.