NOVELTY - The apparatus has a lower fastening unit (52) that is provided for supporting a membrane electrode assembly (55). The deionized water (56) is uniformly distributed on an upper surface of the membrane electrode assembly. A pH test paper (53) is inserted between the membrane electrode assembly and the lower fastening unit. The pH test paper is discolored upon coming in contact with the water that passing through a pinhole (57) to detect the presence and position of the pinhole in the membrane electrode assembly, when the pin hole is provided in the membrane electrode assembly.    USE - Pinhole inspection apparatus for membrane electrode assembly of fuel cell used for supplying electric power to small-sized electrical/electronic device e.g. portable devices, to industrial and domestic applications, and to vehicle e.g. motor vehicle such as passenger vehicle, sports utility vehicle (SUV), bus, truck, various commercial vehicle, boat, ship and aircraft, hybrid vehicle such as petrol-powered and electric-powered vehicle, electric vehicle, plug-in hybrid electric vehicle, hydrogen-powered vehicle and other alternative fuel vehicle.    ADVANTAGE - Since the pH test paper is discolored upon coming in contact with the water that passing through the pinhole, the presence and position of the pinhole from the discoloration of the pH test paper can be detected rapidly and easily without damaging or destroying the components of membrane electrode assembly. As the pre-inspection and the post-deterioration analysis are performed by pinhole inspection apparatus, the structure and use of pinhole inspection apparatus can be simplified. Thus, the workability and working efficiency of pinhole inspection apparatus can be improved. Since the slip sheet is placed on the membrane electrode assembly and then the upper fixture is pressed down, the initial cleanliness of the membrane electrode assembly can be maintained effectively. Thus, the fuel cell stack can be manufactured effectively without preparation of a separate sample. Since the presence and position of the pinhole is detected by the use of water rather than ammonia gas, the harm to the workers during the inspection can be prevented. Since the hydrogen is not used, the electrolyte membrane can be prevented from being burned by the consecutive reaction in the presence of a catalyst. Since acidic or alkaline pH solutions are not used during the inspection of the pinhole, the membrane electrode assembly can be reused after the inspection. Thus, the waste water treatment solution and environmental pollution can be eliminated.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method for detecting pin hole in membrane electrode assembly of fuel cell; and    (2) a system for detecting pin hole in membrane electrode assembly of fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the pinhole inspection apparatus for membrane electrode assembly of fuel cell.    Lower fastening unit (52)    PH test paper (53)    Membrane electrode assembly (55)    Deionized water (56)    Pinhole (57)