An installation structure of a vehicle curtain airbag, which utilizes a holding member of a curtain airbag strap that disengageably holds a strap which connects an end portion of a curtain airbag main body to a pillar of a vehicle body , and that can be attached to the vehicle body while holding the strap , the holding member comprising: a slope oriented towards the exterior and the bottom of the vehicle body when attached to the vehicle body ; wherein the strap can be held on a top face of the slope , with the curtain airbag main body in a stored state; and the slope allows guiding, towards the exterior of the vehicle body , the strap moving in response to deployment and inflation of the curtain airbag main body , the installation structure comprising: a vehicle body including a front pillar and a roof side rail connected to the front pillar ; a front pillar garnish provided in the front pillar so as to cover the front pillar from inside the vehicle body , characterised in that said front pillar garnish has a first locking edge section disengageably locked to the front pillar ; a roof garnish provided in the roof side rail so as to cover the roof side rail from inside the vehicle body , and having a second locking edge section which, in a form connected to the first locking edge section , is disengageably locked to the roof side rail ; a curtain airbag main body , provided in a stored state between the roof garnish and the roof side rail , and being capable of deploying and inflating towards the bottorn of the vehicle body through disengagement of the second locking edge section from the roof side rail ; and a strap that extends along the front pillar , between the front pillar and the front pillar garnish , from a front portion, in a vehicle body front-rear direction, of the curtain airbag main body in a stored state, the strap connecting the curtain airbag main body and the front pillar , wherein the strap is disengageably held by the holding member which can be attached to the vehicle body while being positioned at a position covered by at least one of the front pillar garnish and the roof garnish . a vehicle body including a front pillar and a roof side rail connected to the front pillar ; a front pillar garnish provided in the front pillar so as to cover the front pillar from inside the vehicle body , characterised in that said front pillar garnish has a first locking edge section disengageably locked to the front pillar ; a roof garnish provided in the roof side rail so as to cover the roof side rail from inside the vehicle body , and having a second locking edge section which, in a form connected to the first locking edge section , is disengageably locked to the roof side rail ; a curtain airbag main body , provided in a stored state between the roof garnish and the roof side rail , and being capable of deploying and inflating towards the bottorn of the vehicle body through disengagement of the second locking edge section from the roof side rail ; and a strap that extends along the front pillar , between the front pillar and the front pillar garnish , from a front portion, in a vehicle body front-rear direction, of the curtain airbag main body in a stored state, the strap connecting the curtain airbag main body and the front pillar , wherein the strap is disengageably held by the holding member which can be attached to the vehicle body while being positioned at a position covered by at least one of the front pillar garnish and the roof garnish . <EOS>