This research emphasizes on the use of fillers in practice teaching performance of micro teaching subject. The researcher found that almost all students used fillers. Therefore, the researcher is interested to know kinds of fillers used by female and male, also the cause factors or the reasons of using fillers. There are four kinds of fillers; sound fillers, word fillers, phrase filler and repetition fillers. Also, four reasons of using fillers; nervous, hesitant, divided attention and cognitive process. To answer the research questions, the researcher used two instruments; observation and interview. The population of this research is the students in 2017/2018 who took micro teaching subject. There are 60 students; 52 females and 8 males. However, the researcher used non-proportional sampling with the type quota sampling as the sampling technique. Hence, There were 8 students as the sample; seven females and one male with the scale 1 : 8. The result of the research shows that both female and male used all kinds of fillers; sounds fillers, word fillers, phrase fillers and repetition fillers. However, there were different reasons or cause factors between female and male. The females used fillers because of control nervous, hesitate, to divide attention and in the process of thinking. Meanwhile, male used fillers only because he is in thinking process. Therefore, the researcher concludes that between female and male always use fillers, but the reasons of using fillers are little bit different.