A sun visor apparatus for a vehicle includes a sun visor body, a supporting member supported on a roof panel and supporting the sun visor body so that the sun visor body moves in a longitudinal direction of the vehicle between a first position where the sun visor body is positioned in a storage space provided on an underside of the roof panel and a second position where a rear end of the sun visor body is positioned behind a mirror body of an interior rearview mirror when viewed from a driver, and a shade extending from the sun visor body to the storage space in accordance with a movement of the sun visor body.