A fluid inhaling/exhausting apparatus is provided to reduce a sound pressure peak and generate a nonuniform pitch according to a periodic function to facilitate estimation and control of impeller arrangement. A fluid inhaling/exhausting apparatus includes a rotating member which is formed between impellers and has an impeller groove formed around of the rotating member. The apparatus inhales and exhausts a fluid according to the rotation of the rotating member and an incremental angle between the impellers is set by a predetermined equation.
