NOVELTY - The apparatus has a pair of load applying parts (200) adhered to outer surfaces of a substrate to apply tension force in a direction, in which the substrate and a micro-porous layer are separated from each other. A first adhering part is applied to one of the load applying parts and adhered to the substrate. A second adhering part is applied to the other load applying part and adhered to the micro-porous layer. The first and second adhering parts contain materials, where contact angles of the materials with the substrate or the micro-porous layer are different from each other, respectively.    USE - Apparatus for measuring interfacial adhesion strength of a thin and flexible product i.e. gas diffusion layer, for a fuel cell of a vehicle. Uses include but are not limited to a motor vehicle i.e. passenger automobile such as sports utility vehicles (SUV), bus, lorry and commercial vehicle, a watercraft such as boat and ship, an aircraft, a hybrid vehicle such as petrol-powered vehicle and electric-powered vehicle, an electric vehicle, a plug-in hybrid electric vehicle, a hydrogen-powered vehicle and alternative fuel vehicle.    ADVANTAGE - The apparatus can quantitatively and accurately calculate the interfacial adhesion strength of the gas diffusion layer for a fuel cell by utilizing a pair of cantilevers. The apparatus accurately generates a peeling in an interphase region as a coupling degree of the interphase region determines strength of the gas diffusion layer when a tension force of a load applying part is applied. The apparatus prevents permeation of the liquid with a relatively high contact angle into the object, and allows simple permeating of the liquid with a relatively low contact angle into the object. The apparatus ensures that ratio is set to allow a minimum difference to be generated between the contact angle formed between the adhering material contained in the first adhering part and the substrate, and the contact angle formed between the adhering material contained in the second adhering part and the micro-porous layer for inducing fracture to be accurately generated in the interphase region.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for measuring an interfacial adhesion strength of a gas diffusion layer for a fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an interfacial adhesion strength measuring apparatus for a gas diffusion layer for a fuel cell.    Gas diffusion layer (100)    Load applying parts (200)    Lower cantilever (210)    Upper cantilever (220)    Protrusions (230)