Adhesion is one of the most important technologies for modern technology. However, it is not easy to elucidate the adhesion mechanism because of the multiplicity of influencing factors and also the difficulties in analyzing the interface. Therefore, it is important to set purpose and hypothesis in analysis of adhesion. The analysis is for verifying the hypothesis. For adhesion analysis, surface and interface analysis are the main functions. For example, contact angle, spectroscopic analysis such as XPS, TOF-SIMS, FTIR-ATR and others are generally used. Depth profiling is usually used in the interface analysis, but various ingenious measures such as GSP are required to obtain necessary information. It is important to visualize the true nature by contrasting with such various ideas, utilization of multiple methods, and adhesion behavior.