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This study aims to develop a five-tier diagnostic test that can that be used to identify misconceptions and causes of students- misconception on waves and optics materials. This type of research is development research using a 4-D model. The study was conducted in two junior high schools which in West Bandung, West Java with a sample of 193 students. Data analysis used is quantitative analysis by looking at the quality of the items. The results of the study showed that the content validity test obtained a CVI value of 0.833 which was included in the criteria as very appropriate. The empirical validity test obtained the value of MNSQ 0.98 outfit and ZSTD 0.3 outfit which means that the item corresponds to the measured construct. Item reliability 0.86 and Alpha cronbach 0.87 show good reliability. The differentiating problem showed it was not necessary to remove the question. While Point Measure Correlation shows that the level of difficulty of the questions varies greatly. Overall, it can be concluded that the five-tier diagnostic test developed has met the criteria and was declared feasible for identifying misconceptions and causes of students misconceptions in waves and optics materials.