A vehicle curtain airbag device that includes: front and rear main chambers that receive gas supplied from an inflator, and that inflate and deploy between respective positions of heads of a front seat occupant and a rear seat occupant, and a side section of a vehicle body; and a delay chamber that is provided spanning between the front and rear main chambers, and that is only supplied with gas through a gas supply opening formed at a boundary between the delay chamber and the main chamber on a front side.