A curtain airbag apparatus for a vehicle is configured to connect a curtain airbag cushion to a vehicle body by a cushion restriction device including a tether carriage and a cushion tether to reinforce a restriction force of the deployed curtain airbag cushion, and to reinforce restriction on movement of an occupant during a side collision by use of the curtain airbag cushion having the reinforced restriction force to prevent the occupant from being thrown through a vehicle side window during a side collision even when a panorama window is used as the side window.