Following the previous report, it is developed here how to estimate the form drag of a body, especially the pressure one. The contents are divided into two parts. The first half is the method of calculation of frictional resistance. The principle is just the same as Buri's method, and after reanalysis of the various authors' data numerical constants are modified slightly. The latter half is about the so-called pressure drag and divided again into two cases according to the existence of separation or not. Without separation, introducing a newly defined “pressure thickness”, the pressure drag is obtained as the product of it and the pressure gradient normal to the wall in potential flow. When separation exists, two governing relations are considered in the separating boundary layer which was named by Schubauer. These are the momentum equation and the assumed law of similarity of velocity distribution. Solving the two simultaneously we get the pressure on the layer which may be considered to act also on the body surface. Numerical calculation is carried out for three kinds of symmetical aerofoils and the comparison with experiments shows a reasonable agreement in practical sense. Detailed discussion about the position of separation and the effect of Reynolds number is left in future research.