A total of 780 Salmonella serovar Hadar (S. Hadar) strains consisting of 601 domestic strains and 179 imported strains isolated in Tokyo, 1980-1998, were examined regarding their incidence and drug-resistance. Domestic strains accounted for 7.2% of all Salmonella (8,359 strains) isolated from domestic cases, and imported strains accounted for 4.4% of all Salmonella (4,083 strains) isolated from imported cases. A drug-resistance test using 9 drugs (CP, TC, SM, KM, ABPC, ST, NA, FOR, and NFLX) showed that 586 strains (97.6%) of the domestic strains and 175 strains (97.8%) of the imported strains were resistant to some of the drugs, excluding NFLX. Drugs with a high resistance rate were TC and SM for both groups. Drug-resistance patterns of the resistant strains varied among the 24 types. Among those, prevalent patterns recognized were TC.SM.KM (231 strains), TC.SM (205 strains), and TC.SM.KM.ABPC (65 strains) in the domestic strains, and TC.SM (135 strains) and TC (13 strains) in the imported strains.