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This paper deals with cross-apparatus comparisons of an insulation design of electric power apparatus. Focusing on a gas insulated switchgear (GIS), an oil-filled transformer, a cable, and a capacitor, we summarize the different and common features of their insulation design on the basis of not only referring literatures but also the authors' experiences. The insulation design process has three evaluation steps. Each step optimizes its evaluation subject by considering the nature of an insulation medium or an insulation component, and the optimization result is different. However, it is common that the insulation design process has three steps without exceptions. The technology supporting the three steps is also common. Index Terms--Electric power apparatus, insulation design, gas insulated switchgear, power transformer, power cable, power capacitor.