A vehicle air-conditioning air blower configured to be mounted in a vehicle, comprising: a casing having an inside air inlet (2a, 2b) through which air inside a cabin is introduced into the casing, and an outside air inlet through which air outside the cabin is introduced into the casing, the casing further having a first air passage and a second air passage each communicating with both of the inside air inlet (2a, 2b) and the outside air inlet, the casing housing an inside/outside air switching damper (6, 7) that opens and closes the inside air inlet (2a, 2b) and the outside air inlet; a centrifugal blower fan disposed inside the casing and having a first blower fan defined as a portion of the blower fan providing with a first blade and a second blower fan defined as a portion of the blower fan providing with a second blade; a motor disposed below the blower fan and having a rotation shaft that rotates to drive the blower fan and that extends vertically; and a bell mouth component being a separate member from the casing, the bell mouth component including a bell mouth plate extending in a radial direction of the blower fan and having a bell mouth orifice disposed to face a lower side of the blower fan, the first blower fan sending air in the first air passage as air-conditioning air by the first blade, the second blower fan sending air in the second air passage as air-conditioning air by the second blade, wherein the motor has a lower portion that includes a motor flange extending in the radial direction of the rotation shaft and being fixed to a bottom wall portion of the casing, and characterized in that the bell mouth component includes an engagement claw engaged with the motor flange with the bell mouth component not fixed to the motor flange with the motor flange detached from the casing, and a plurality of legs extending downward from the respective positions of the bell mouth plate apart from each other in a circumferential direction of the rotation shaft and supported in contact with the motor flange, the engagement claw is integral with a lower end of each of the legs, the motor flange has a holder having an engagement hole with which the engagement claw engages, the engagement claw has a width narrower than a width of the engagement hole, and the engagement hole has a vertical dimension longer than a vertical dimension of the engagement claw. a casing having an inside air inlet (2a, 2b) through which air inside a cabin is introduced into the casing, and an outside air inlet through which air outside the cabin is introduced into the casing, the casing further having a first air passage and a second air passage each communicating with both of the inside air inlet (2a, 2b) and the outside air inlet, the casing housing an inside/outside air switching damper (6, 7) that opens and closes the inside air inlet (2a, 2b) and the outside air inlet; a centrifugal blower fan disposed inside the casing and having a first blower fan defined as a portion of the blower fan providing with a first blade and a second blower fan defined as a portion of the blower fan providing with a second blade; a motor disposed below the blower fan and having a rotation shaft that rotates to drive the blower fan and that extends vertically; and a bell mouth component being a separate member from the casing, the bell mouth component including a bell mouth plate extending in a radial direction of the blower fan and having a bell mouth orifice disposed to face a lower side of the blower fan, the first blower fan sending air in the first air passage as air-conditioning air by the first blade, the second blower fan sending air in the second air passage as air-conditioning air by the second blade, wherein the motor has a lower portion that includes a motor flange extending in the radial direction of the rotation shaft and being fixed to a bottom wall portion of the casing, and characterized in that the bell mouth component includes an engagement claw engaged with the motor flange with the bell mouth component not fixed to the motor flange with the motor flange detached from the casing, and a plurality of legs extending downward from the respective positions of the bell mouth plate apart from each other in a circumferential direction of the rotation shaft and supported in contact with the motor flange, the engagement claw is integral with a lower end of each of the legs, the motor flange has a holder having an engagement hole with which the engagement claw engages, the engagement claw has a width narrower than a width of the engagement hole, and the engagement hole has a vertical dimension longer than a vertical dimension of the engagement claw.