The ability to mathematical representation is important for students to have. This study aims to describe the mathematical representation ability of junior high school students based on self-efficacy on the dimensions of generality, level, and strength. This study uses a descriptive qualitative approach with the subject of three seventh-grade students in Cibunar Village. Data were collected through observation, tests, and interviews. The data were analyzed in the stages of data reduction, data presentation, and concluding. The results showed that the mathematical representation ability of students who met the three dimensions of self-efficacy had not been able to meet the indicators of making mathematical models of the problems given and presenting data or information representations to diagrams, graphs, or table representations. Two students who meet the two dimensions of self-efficacy are both only able to achieve one indicator of mathematical representation ability, namely using diagrams as a solution facility. This shows that self-efficacy affects the ability of mathematical representation.