Nitrogen mineralization in soil, which is well known as a fundamental ecosystem functioning, depends on the moisture, the temperature, the organic content and the composition and activities of microbial communities in soil. The aim of this study was to quantify net nitrogen mineralization (NNM) and to examine the NNM in response to different environmental factors in Miyake-jima island where the volcano has been erupted for several times. Most recent eruption of this island was in 2000 and it caused great damage to wide range. As a result, there were various ecosystems that differed based on the level of damage. We measured the NNM rate in field by using resin core in situ methods in 11 sites during the growing season of 2013. In addition to the NNM rate, we monitored the moisture, the temperature, and we also analyzed organic matter content of surface soil. Our result showed that the NNM rate range were 1.06mg N•kg-1 soil•d-1 to -0.078mg N•kg-1 soil•d-1 among all the sites. The NNM rate was increased from heavy damage stage until the moderate damage stage then decreased and reached the minimum value at the light damage stage.