This study examined sport achievement orientation within the Japanese sport setting. 1,836 male and 425 Female athletes ( M age = 18.6 yr.) from 47 sports completed the Japanese version of the Sport Orientation Questionnaire (24 items), and 1,781 males and 421 females ( M age=18.6 yr.) from 47 sports completed that of the Task and Ego Orientation in Sport Questionnaire (14 items). While the original English versions of the questionnaires are composed of three and two factors, respectively, present exploratory factor analyses identified four factors in the Sport Orientation Questionnaire and three in the Task and Ego Orientation in Sport Questionnaire. In this study, two types of the SOQ Competitiveness and the TEOSQ Ego Orientation emerged even though the original versions included only one type. A one-way analysis of variance indicated that sex differences were significant for all subscales. Sex differences in the Sport Orientation Questionnaire of Japanese resembled those of Americans, The overall factor reliability and validity based on the sample suggested that the modified Japanese versions of the two questionnaires can be valuable in the investigation of sport achievement orientation in Japanese sport and exercise settings.