BLOWER DEVICE

PROBLEM TO BE SOLVED: To miniaturize a blower device utilized for a ventilating fan or an air conditioner.SOLUTION: The blower device is composed of: a body case 1; a centrifugal fan 6 provided in the body case 1; a motor 8 fixed to the body case 1, with the rotating shaft 9 connected to the centrifugal fan 6; and an electronic part 25 such as a semiconductor element for controlling the rotation of the motor 8. A rotor complete body 21 is fixed with a bearing bracket 22, and a heat radiating silicon 24 is interposed between the electronic part 25 and the bearing bracket 22. An opening of an air suction port 2 side of the body case 1 of the centrifugal fan 6 is set as a large diameter opening 6a, an opening on the opposite side is set as a small diameter opening 6b having a diameter smaller than the large diameter opening 6a, and an outer diameter of the centrifugal fan 6 is formed to be small on a small diameter opening 6b side than a large diameter opening 6a side, configuring such that the motor 8 is fixed at a body case 1 portion opposed to the small diameter opening 6b of the centrifugal fan 6.