A coming-off preventing contacting piece 6 that extendingly projects in the radial direction of a shaft 3 throughout the entire periphery is formed in an insertion-side part 3a of the shaft 3 that turnably supports a sun visor body 1, and a contacted piece 7 with which the coming-off preventing contacting piece 6 contactingly engages is formed on the sun visor body 1 side to prevent the sun visor body 1 from coming off the shaft 3. Thereby, even if the sun visor body 1 receives a high expandingly deploying force of a curtain airbag, the concentrated load per unit area applied to the coming-off preventing contacting piece 6 is kept low, and therefore the coming-off preventing contacting piece 6 is restrained from being broken.