A tether clip apparatus preventing an A pillar from completely separating from a car body at the time of deploying an airbag, may include a pillar fixing clip fixed to the A pillar, a car body fixing clip configured to be fixed to a car body panel, inserted with the pillar fixing clip, and preventing the A pillar from completely separating from the car body panel while moving within the pillar fixing clip at the time of deploying the airbag, and a metal clip elastically supporting the pillar fixing clip and the car body fixing clip so as not to separate from each other.