To execute a crown member installed at the ridge of a roof accurately and quickly by simple operation.

This fixture consists of a support member 1 fixed to both side sections of a ridge along the longitudinal direction of the ridge and a crown member 8 covering the ridge extending among roofing tiles laid on both sides of the ridge, and the support member 1 has upright sections 5 fixing the crown member 8 onto a substrate 2 attached to battens, projecting sections 3 projected towards upper sections and recessed sections 4, in which upper sections are opened. Voids among the leg sections 10 of the crown member 8 and the roofing tiles are sealed with an adhesive material 14 having cushioning properties and watertightness, and receiving members 13 having cushioning properties and watertightness are installed to the rears of the roofing tiles in the recessed sections 4 of the support member 1.