The invention relates to a cluster ionizer for a vehicle. The cluster ionizer uses a needle electrode and includes a case, and a housing disposed in the interior of the case. An ion generating elementfor generating positive ions and negative ions by applying a driving voltage, and a winding coil and a circuit board for generating the driving voltage that is applied to the ion generating element are mounted in the interior of the housing having a hollow housing part that is communicated with the outside of the housing and is blocked from the interior of the housing. A needle electrode that hassharp part, opposite ends of which are formed sharply to have two needle shapes as the ion generating elements, and a substantially T-shaped protection part extends between the sharp parts so that adirection physical contact with the sharp parts is interrupted.