We relocated an endangered species "uca lactea lactea crab" , which was discovered in the Port Kasumigaura Northern Wharf work zone, Yokkaichi City, Mie Prefecture. The uca lactea lactea crab mainly lives in the salty marshes and estuary tidelands. However, due to the large-scale port repair, embankment and renewal, the crabs lost their habitat, causing them to be listed on the Ministry of the Environment's Redlist (2012) and Mie Prefecture Redlist (2014) as a Class 2 Endangered Species. In mid-July 2014, we were informed by local residents that the uca lactea lactea crabs are still alive along the left bank of Asake River Estuary. Along with investigating their distribution, we examined the impact by the construction and its preservation measures. With these studies, 56 crabs were confirmed (40 males and 16 females), while 33 were predicted to be directly affected by the construction (overlapping with construction range). Thus, Mirai Construction Co.,Ltd. decided to relocate the 33 crabs outside the construction range.