Seven Haemaphysalis ticks were found positive in PCR assay of gltA gene to detect the spotted fever group (SFG) rickettsiae DNA from 100 ticks. The nucleotide sequence of 16S rRNA gene was determined from 5 ticks and compared to those of other Rickettsia strains. The nucleotide sequence from 4 ticks showed high homologies (99.7 to 100%) with that of R. japonica YH, and that from 1 tick (tick no. 48) was identical with that of R. rickettsii R, suggesting that SFG rickettsiae exists in Korea. This is the first documentation of SFG rickettsiae in Korea.