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A simple theoretical analysis was carried out in order to clarify the general characteristics of pressure loss in exhaust gas flow induced when exhaust gas passes through a catalyst, which is generally used for the purification of exhaust gas emitted from automobile engines. Namely, Darcy's friction factor was applied to an equation, which is well known in the field of fluid dynamics, to determine the pressure drop of fluid flowing in a flow path. Using this friction factor, the air pressure difference between the upstream and downstream of the catalyst was calculated using the hydraulic diameter of the catalyst cell, the Reynolds number based on the hydraulic diameter of the catalyst cell, the length of the catalyst, and the density and velocity of the air flowing in the catalyst cell. Here, the flow of air is a laminar flow, which is assumed to be in the steady state, and the cross-sectional shapes of the catalyst cells examined are square, circle and equilateral triangle.