This current research aimed to explore the students' level in understanding in the concept of matrix rank based on the APOS (Action, Process, Object, and Schema) theoretical framework. Qualitative approach and exploratory type were employed. The subjects in this research were the students of mathematics department which consist of 48 people. The first data was collected by giving the assignment about matrix rank to 48 students. Then based on the result of the assignment, in-depth interviews was employed to 6 students to collect more data. The results showed that the level of students' understanding in the concept of matrix rank lies at the four stages of the APOS theory framework.
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