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The infrared spectra of 44 kinds of benzenesulfonamide derivatives and a few naphthalenesulfonamide derivatives were measured and compared with the benzenesulfonic acid derivatives. The sulfonamide derivatives showed two characteristic bands near 900 cm^<-1> and 1090 cm^<-1> regions, but the latter didn't show the bands near 900 cm^<-1> region. The infrared spectra of deuterated benzenesulfonamide derivatives were examined. In the compound in which nitrogen atom is directly attached to hydrogen, the band near 900 cm^<-1> region shifted about 38〜100 cm^<-1>. However, in case of the compounds where nitrogen atom is not attached to hydrogen, the band near 900 cm^<-1> region did not shift on deuteration work. These facts suggest that the band near 900 cm^<-1> region can be ascribed to S-N vibration.