Catching environmental load of port structures throughout life-cycle is a social-necessity in Japan where a lot of port constructions have been planed and carried out. Also, use of recycled material is demanded for the constructions in the landfill shortage situation. This paper tries to calculate environmental load, -CO₂, NOx, SOx, and Energy in this paper-, of port structures constructed by four different materials. Caission is made up of first material in case A0, converter slag in case A1, ferronickel slag in case A2, and copper slag in case A3. Each case shows a similar trend, but case Al and A3 has lower environmental load than case A0 and A2 does. In the calculation of CO₂, this paper tries to identify the processes that produce high environmental load, and reveal relations between the transport distance of recycled material and the amount of discharged CO₂.