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棟瓦を構成する熨斗瓦を固定する棟瓦固定具であって、棟にまたがって対の熨斗瓦を載置する台座部を具え、当該台座部が、前記熨斗瓦に設けられた凸部に嵌合する凹部、または、前記熨斗瓦に設けられた凹部に嵌合する凸部を具えることを特徴とする棟瓦固定具。A ridge tile fixing device for fixing noshi tiles that make up ridge tiles, comprising a base portion on which a pair of noshi tiles are placed across the ridge, the base portion comprising a recess that fits into a protrusion provided on the noshi tiles, or a protrusion that fits into a recess provided on the noshi tiles.請求項１に記載の棟瓦固定具において、前記台座部の断面中央部から下方に延在する脚部を具えることを特徴とする棟瓦固定具。2. The ridge tile fastener according to claim 1, further comprising a leg portion extending downward from the center of the cross section of the base portion.請求項２に記載の棟瓦固定具において、前記脚部先端に係合部を設け、屋根基材又は一段下の棟瓦にこの係合部を係合させて棟瓦を固定するように構成したことを特徴とする棟瓦固定具。3. The ridge tile fastener according to claim 2, wherein an engaging portion is provided at the tip of the leg portion, and the ridge tile is fastened by engaging this engaging portion with the roof substrate or the ridge tile one level below.