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; and a motor disposed below the blower fan and having a rotational shaft that rotates to drive the blower fan and that extends vertically, 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 vehicle air-conditioning air blower further includes a bell mouth component including a bell mouth plate that has a bell mouth orifice disposed to face a lower side of the blower fan and extending in a radial direction of the blower fan, the bell mouth plate has an outer circumferential side with respect to the bell mouth orifice, characterized in that the outer circumferential side has a drainage hole through which water on the top of the bell mouth plate is drained downward of the bell mouth plate, and the bell mouth component includes a wind shield (62, 63) that extends downward from the circumference of an opening of the drainage hole on the lower surface of the bell mouth plate and that avoids wind from reaching the circumference of the opening. 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; and a motor disposed below the blower fan and having a rotational shaft that rotates to drive the blower fan and that extends vertically, 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 vehicle air-conditioning air blower further includes a bell mouth component including a bell mouth plate that has a bell mouth orifice disposed to face a lower side of the blower fan and extending in a radial direction of the blower fan, the bell mouth plate has an outer circumferential side with respect to the bell mouth orifice, characterized in that the outer circumferential side has a drainage hole through which water on the top of the bell mouth plate is drained downward of the bell mouth plate, and the bell mouth component includes a wind shield (62, 63) that extends downward from the circumference of an opening of the drainage hole on the lower surface of the bell mouth plate and that avoids wind from reaching the circumference of the opening.