This paper presents largely severe natural disasters had happened in Japan, and efforts to unmanned construction until now. First, problems in responses to post-disaster restoration and reconstruction are reported. Secondly, are described demonstration of ultra-long-distance unmanned construction and the requirements for the deployment. Thirdly, this paper presents research and development on autonomous crawler carrier. Finally, concluding remarks and further works are reported. In addition, are proposed levels of promising applicability of robots in responses to post-disaster restoration and reconstruction.