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Mathematical communication skill are very important for the students of Madrasah Ibtidaiyah. Students who have good mathematical communication skill are able to express and accept mathematical ideas carefully, analytically, critically and evaluatively so they will understand mathematical concepts. This study aims to identify the learning obstacles faced by students in mathematical communication skill in the volume of cubes and beams subject. This research was part of the Didactical Design Research (DDR) conducted at one of the Madrasah Ibtidaiyah in Bandung Regency. Research participants were 13 of sixth grade students. Data collection is done by test, interview, and observation. Based on the research, we found difficulties faced by students in mathematical communication skill on volume of cubes and beams subject which are categorized into ontological, didactical, and epistemological obstacle. For this reason, further research is needed in the form of learning design to overcome the learning obstacle.