GAS DIFFUSION LAYER WITH FLOWPATH

[Problem] To provide a thin gas diffusion layer with flowpath while ensuring superior gas diffusion. [Solution] A gas diffusion layer with flowpath in which electroconductive wires A for forming flow channels are disposed upon an electroconductive substrate B, the flow channels formed by the electroconductive wires A having a height of 300 µm or less, and flow channels formed by adjacent electroconductive wires A having an equivalent diameter of 300 µm or less.