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With the recent demands for reducing energy and resource in construction industry and automobiles, production of high strength steels is increasing. It is, however, well known that increasing strength of steels generally leads to higher susceptibility to hydrogen embrittlement.1,2) A reduction in susceptibility to hydrogen embrittlement of high strength steels has become an important issue to ensure reliability and safety in the practical use of steels. Hydrogen embrittlement has, therefore, attracted much attention recently.3–14) Several techniques such as thermal desorption spectroscopy,15) hydrogen microprint technique,16) silver decoration method,17) electrochemical hydrogen detection,18,19) and tritium autoradiography20) have been applied to measure or visualize hydrogen in the metals. The hydrogen entry efficiency (ratio of hydrogen permeation current and hydrogen generation current) and hydrogen diffusion coefficient, DH, may depend on grain boundary and segregation at the entry surface. However, these effects on hydrogen permeation behavior are not fully understood mainly due to the difficulty of the control of the entry area of hydrogen. To reveal these effects on hydrogen permeation behavior, an area-selective hydrogen detection technique was newly developed in the current study. A focused pulse YAG laser irradiation can activate anodic reaction at the irradiated area.21,22) In the case of immersion corrosion of iron, the activation of anodic reaction Development of an Area-selective Technique for Electrochemical Hydrogen Detection with Laser Local Activation