This research aims to find out the type of student error in solving the problem of mathematics material in solving the problem of circle story and wide circle in class VIII SMP Negeri 1 Wlingi Blitar.Dalam this research type of research used is descriptive qualitative research. The subject of this study is the class VIII C MPN 1 Wlingi which amounted to 10 students who took the test.Teknik data collection in this study using written tests, interviews and documentation.Keabsahan data is done with reference materials and conduct checks members.Teknik data analysis is done with data reduction stages, data presentation, and verification or drawing conclusions. Students are grouped into three categories namely high-ability students, medium-skilled students and low-ability students. Each category is represented by one student. The results of this study are (1) The type of mistake made by a highly capable subject in solving soa l circle story and broad circle is a mistake of fact, error of concept and mistake of principle. (2) Types of moderate-ability students' mistakes are factual errors, concept errors and procedural errors. (3) Types of low-skill students' errors are fact errors, concept errors, procedural errors and principle errors