Provided is a method for producing a chronic cystitis model non-human animal. According to the method for producing a chronic cystitis model non-human animal of the present invention, a model animal that appropriately represents a pathological condition of chronic cystitis can be provided by administering hydrogen peroxide to the non-human animal. The hydrogen peroxide can be administered, for example, directly or indirectly to the bladder and is preferably administered from the urethra. Since the model non-human animal obtained by the production method of the present invention can maintain the pathological condition of cystitis for a long time, it can be said that it is extremely useful, for example, for screening for a therapeutic candidate for chronic cystitis.慢性膀胱炎モデル非ヒト動物の製造方法を提供する。 本発明の慢性膀胱炎モデル非ヒト動物の製造方法によれば、過酸化水素を非ヒト動物に投与することで、慢性膀胱炎の病態を適切に表すモデル動物を提供できる。前記過酸化水素は、例えば、直接的または間接的に膀胱に投与でき、尿道からの投与が好ましい。本発明の製造方法により得られたモデル非ヒト動物は、膀胱炎の病態を長く維持できるため、例えば、慢性膀胱炎の治療候補剤のスクリーニングに、極めて有用といえる。