This study aims to clarify how organizational adaptation in young workers, particularly nurses, is different in three mental states?reality shock, conformity, and positive surprise. These three states represent psychological conditions at the time of organization entry. The sample was of 237 young nurses. The analysis showed that in young nurses, organizational adaptation is different in psychological condition at the time of organizational entry. Young nurses who experienced a reality shock had shown low levels of organizational adaptation. And, young nurses who experienced a conformity and positive surprise had shown high levels of organizational adaptation.