Continuous beam monitoring can ensure beam stability during beam irradiation for charged particle therapy .It can also detect the beam which is not synchronized with a patient's respiratory in case of treatment of an organ moving with respiratory. A MWPC was adapted to these purposes. It was used in air not to disturb beam. The effective thickness of the MWPC with respect to the beam is only that of wires. Therefore, scattering the beam and losing the energy of the beam in the MWPC is sufficiently small so that they do not affect charged particle therapy. The MWPC was proved to be useful by use for biology experiments.
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