Non-structural components of mooring facility such as yard apron and ancillaries are important equipment for ensuring safe and smooth operation in the facility. They often suffer deterioration and deformation under severe environmental and usage conditions, however, quantitative evaluation method of decline in their functional performance has not been developed to date. The decline in functional performance of ancillaries would consequently become one of main causes of decrease in safety and serviceability of the mooring facility.
　This paper reports the results of the factual investigation on the decline in functional performance of mooring facilities in Japanese ports with focusing on deterioration and/or deformation observed in face-line of wharf, yard apron and ancillaries, such as bollard and fender. The problems for developing quantitative evaluation method of functional performance from the viewpoint of safe and smooth operation in the facility were made clear from the investigated results. Applying the sensory evaluation technique, the influence degree on functional performance and the relationship between deterioration grades of each member and functional performance of the facility were evaluated statistically. Finally, quantitative evaluation method of functional performance was developed for achieving the strategic maintenance of mooring facility.