Student misbehavior is the behavior or actions of students that can cause problems, harm themselves or others, and violate moral and social values. Student misbehavior occurs in all schools from time to time. This study aims to determine (1) what factors influence the misbehavior of fourth grade students at SD Muhammadiyah Wirobrajan II, (2) what are the forms of student misbehavior in grade IV at SD Muhammadiyah Wirobrajan II. This type of research is a qualitative research using a case study paradigm. This research was conducted at SD Muhammadiyah Wirobrajan II Yogyakarta. The object of this research was the misbehavior of fourth grade students at SD Muhammadiyah Wirobrajan II Yogyakarta. The data collected in this study were interview transcripts, observation sheets, and documentation. The data analysis technique used the Miles and Huberman model, namely data collection, data presentation, data reduction, and drawing conclusions. Checking the validity of the data was done by using source triangulation technique. The results showed that (1) student misbehavior that appeared such as fighting, making trouble, and disobeying school rules. The misbehavior is not only caused by the students themselves but also caused by their families and the surrounding environment. The influence of the family includes the lack of attention from parents and family disharmony. An unfavorable environment also affects the incidence of student misbehavior. (2) the form of misbehavior committed by students, namely saying dirty sentences and disturbing friends during learning done on purpose, causing a commotion in class. The efforts of teachers and schools in overcoming student misbehavior are (a) giving a warning, (b) giving punishment, and (c) making a student agreement. These efforts are made to provide a deterrent effect so as not to repeat the misbehavior. Keyword : delinquency, elementary school. 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