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The electrocatalyst layer of polymer electrolyte fuel cells(PEFCs) formed a three-phase interface by using a mixture of Pt/C and a proton-conductive polymer. In the case where Nafion was used as a proton-conductive polymer, some extent of platinum particles of Pt/C were covered by a insulation property cluster of Nafion ; therefor, an efficient formation of the threephase interface was not achieved. In the present study, polyelectrolyte complex(PEC) was used with Pt/C instead of Nafion. PEC, which has a small cluster size, could be expected not to cover the Pt particle. An electrode catalyst layer consisting of the Pt/C and a PEC was prepared on an Au flag electrode. The platinum utilization efficiency was measured by cyclic voltammetry. As a result, it was found that the Pt surface area of the Pt/C-PEC was 1.5-times larger than that of Pt/C-Nafion.