To provide a metal member to which an aquatic life is hardly adhered, and which is light weight, a net body and a crawl using them.SOLUTION: A metal member 21 comprises an Al alloy substrate 24, and a coating layer 25 provided on the surface of the substrate 24 and including at least Zn.SELECTED DRAWING: Figure 4【課題】水生生物の付着を抑制でき、且つ、軽量化された金属部材、網体及びこれを用いた生簀を提供する。【解決手段】金属部材21は、Al合金の基材24と、基材24の表面に設けられ、少なくともZnを含む被覆層25と、を備える。【選択図】図4