Motivation is a key of success in process of learning English. Student who has high motivation would do the best in learning even though the materials were felt difficult. Conversely, student who has low motivation would get bored and be indifferent in learning even though the materials given were so easy.In line with this, this study tried to investigate about students’motivation in learning English, either integrative or instrumental motivation.The purpose of this study is to find out about types of students’ motivation, the dominant type of students’ motivation, and the reasons of the dominant type of motivation in learning English. This study used descriptive-qualitative method with case study approach that examine nine of the first-year students English education study program with three different ability levels; low ability level, medium ability level and high ability level.This study used questionnaires that consist of close-ended and open-ended questions as data collection technique. The results of this study found that all of the students (low-medium-high ability level) have in both of categories (integrative and instrumental), but they tend to have an integrative in learning English. It clarified thatthey were more dominant in integrative than instrumental motivation. It could be seen from the results of open-ended question. Firstly, the students learn English to get new insight about a lot of things related to English, Secondly, they want to communicate easily with English speakers. Thirdly, they want to share their knowledge that they got to other people. Fourthly, they want to participate freely in the activities among other groups who speaks English. Lastly, they want to be proficient in English, so they will be able to behave like native English speaker.