The present invention provied a deodorizer is characterized by comprising transition alumina which has a diffraction peak for [gamma]-AlOOH in a powder X-ray diffraction pattern. The transition alumina is preferably a compound represented by formula (1). (1) xNa2O·Al2O3·nH2O (wherein x represents a numeral value of 0.002 to 0.02; and n represents a numeral value of 0.03 to 0.3.).本發明之消臭劑之特徵為由在粉末X射線繞射圖型中具有由γ-AlOOH之繞射波峰之過渡氧化鋁所成。過渡氧化鋁較好為以下述式(1)表示之化合物。xNa2O.Al2O3.nH2O (1)(式中,x為0.002~0.02之數,n為0.03~0.3之數)。