Including the first two cases of human infestation with ixodid ticks that were reported by Ogura and Takada (1925) in Hokkaido, a total of 10 cases have been reported until the present time. The author adds the other 7 cases of human infestation with females of Ixodes persulcatus Schulze : case 1,left scapula; case 2,left inguen; case 3,lower part of right nipple on breast; case 4,lower part of right occipital region; case 5,parietal region; case 6,inside of left forearm; case 7,left side of waist. Tick species found from these 17 cases were 12 Ixodes persulcatus, 3 I. ovatus, 1 I. nipponensis (?), 1 I. ricinus (?). Of these 17 cases, 2 cases were found in late May, 7 cases in June, 3 cases in July, 1 case in August and 2 cases in September; 2 cases were unknown of their month of occurrence.
