This study deals with the seismic performance of an open-type marginal wharf on coupled raking steel pipe piles. Nonlinear dynamic analysis on the two-dimensional model was performed to understand dynamic response characteristics of the wharf during two levels of earthquakes. The analytical results showed that pulling out of the raking piles governs the seismic performance of the overall structure. After pulling out of the piles, horizontal displacement of the structure became large. Dynamic analysis on the wharf with multi-mass system ground was carried out to compare its results with those of the two-dimensional model. While some differences existed in the horizontal displacement, the two analytical results were almost the same, which confirmed the applicability of the simplified analytical model. The results of push-over analysis fit to the results of the other two analytical models and it was concluded that the push-over analysis would be of use to examine seismic performance of the wharf.