A vehicle safety device includes a vehicle seat, an inflator, a far-side airbag and a tension tether. The far-side airbag is configured to inflate and deploy forward and upward with respect to the vehicle seat from a seatback inner side portion by a gas being supplied into the far-side airbag. The far-side airbag protrudes higher than a headrest when the far-side airbag is in an inflated and deployed state. The tension tether extends upward from a predetermined portion of an upper end portion of a seatback frame and hooks around the headrest from behind the vehicle seat in the inflated and deployed state. The tension tether extends from an upper surface of the headrest toward an upper surface of the far-side airbag, and further extends toward the seatback frame on a vehicle inside with respect to the far-side airbag in the inflated and deployed state.