A vehicle curtain airbag device has a curtain airbag. The curtain airbag is configured such that: a front end side is Z-folded toward a vehicle width direction inner side, the curtain airbag is further folded top-to-bottom, and, in the stowed state, a front end portion at the Z-folded region is covered by a rear end portion of a front pillar garnish; a corner portion at a front end side and an upper end side of the front side sub chamber is formed in a circular arc shape; and in a mid-deployment state, a front end side and an upper end side of the Z-folded region are covered, the corner portion overlaps a vehicle width direction outer side of the rear end portion, and a rear end of the corner portion is positioned further to a vehicle rear side than a rear end of the front pillar garnish.