An air-conditioning air blower configured to be mounted in a vehicle comprising: a casing having an inside air inlet (2a, 2b) through which air in 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 housing an inside/outside air switching damper that opens and closes the inside air inlet (2a, 2b) and the outside air inlet; a blower fan disposed in the casing; and a motor including a rotation shaft extending in a top-to-bottom direction, the casing having therein 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 blower fan being disposed above the motor, the blower fan including a first blade disposed in the first air passage, and a second blade disposed in the second air passage, the first blade being used to send air in the first air passage as air-conditioning air, the second blade being used to send air in the second air passage as air-conditioning air, the blower fan including a fixed portion fixed to the rotation shaft, a cone portion extending from the fixed portion in a radial direction of the rotation shaft, and the first blade and the second blade are fixed to a radially outer surface of the cone portion, the cone portion having an inner peripheral portion and an outer peripheral portion, the inner peripheral portion extending radially outward from a vertically intermediate portion of the fixed portion, and being inclined or curved downward toward a radially outer end of the inner peripheral portion, the outer peripheral portion extending upward from the radially outer end of the inner peripheral portion, and being inclined or curved radially outward toward an upper end of the outer peripheral portion, the inner peripheral portion and the outer peripheral portion forming the cone portion recessed downward, the lowest portion of the cone portion having a drainage hole through which water on an upper surface of the cone portion is drained downward of the cone portion, and the cone portion being inclined downward toward a lower edge portion of the drainage hole. a casing having an inside air inlet (2a, 2b) through which air in 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 housing an inside/outside air switching damper that opens and closes the inside air inlet (2a, 2b) and the outside air inlet; a blower fan disposed in the casing; and a motor including a rotation shaft extending in a top-to-bottom direction, the casing having therein 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 blower fan being disposed above the motor, the blower fan including a first blade disposed in the first air passage, and a second blade disposed in the second air passage, the first blade being used to send air in the first air passage as air-conditioning air, the second blade being used to send air in the second air passage as air-conditioning air, the blower fan including a fixed portion fixed to the rotation shaft, a cone portion extending from the fixed portion in a radial direction of the rotation shaft, and the first blade and the second blade are fixed to a radially outer surface of the cone portion, the cone portion having an inner peripheral portion and an outer peripheral portion, the inner peripheral portion extending radially outward from a vertically intermediate portion of the fixed portion, and being inclined or curved downward toward a radially outer end of the inner peripheral portion, the outer peripheral portion extending upward from the radially outer end of the inner peripheral portion, and being inclined or curved radially outward toward an upper end of the outer peripheral portion, the inner peripheral portion and the outer peripheral portion forming the cone portion recessed downward, the lowest portion of the cone portion having a drainage hole through which water on an upper surface of the cone portion is drained downward of the cone portion, and the cone portion being inclined downward toward a lower edge portion of the drainage hole.