To provide a surface coated cemented carbide cutting tool with an artificial diamond coating layer having excellent adhesion.

This surface coated cemented carbide cutting tool is provided by forming an artificial diamond coating layer or an artificial diamond carbonate coating layer of average thickness 4-5 μm on a surface of a carbide base body having a composition composed of Co of 1-20 wt.% contained as a binding phase forming component and WC and inevitable impurities as a dispersed phase forming components, wherein inside WC particles do not have substantial particle growth and maintain a sintered lump condition in a longitudinal section structure observation, while an uppermost surface portion substantially consist of WC particles and this WC particles have a board shape structure in which a crystal surface grew in such a condition that its thickness does not change in a longitudinal direction against the base body surface (100).