Unmanned construction work is civil engineering work carried out by remotely operating construction machinery located in a caution zone (a zone whose entry is prohibited or restricted), thus enabling the operator to perform remote work from inside the safe area without any need to enter the caution zone. This technology came into being as a result of a proposed public offering of technology from each civilian company, which utilized the test field* of January 1994, and also technology verification at the site. From then onward to the present time, new technology was acquired continuously, then it evolved, and spread throughout Japan. This paper describes the birth of unmanned construction, the development of related technology, and the trend of current technology. *A system for constructing a life-size building intended for increasing the degree of completeness through technology verification in the field.