An operation apparatus of a sunlight shielding apparatus is provided which is equipped with a fail-safe function so as not to hinder behavior of a dweller or the like, and, in usual operation, unnecessary activation of the fail-safe function is prevented, so that enhanced operability can be realized. In a sunlight shielding apparatus in which an operation cord of an endless type is suspended from a pulley supported so as to be capable of rotating in a head box, and a driving shaft is rotated based on an operation of the operation cord by way of the pulley so as to drive a shielding member, the operation cord 16 is made into an endless type by coupling via a coupling section which is configured to be decoupled with a predetermined first pull force, and a torque limiter 18 is interposed between the pulley 15 and the driving shaft 11, 12, the torque limiter being configured to run idle with a second rotation torque which is smaller than a first rotation torque which is exerted on the pulley by the first pull force.