In the previous paper, the author presented an approximate calculation method of nonlinear two-dimensional hydrodynamic problem of a ship with forward speed in large amplitude waves. In this paper, 2 nd report, it is assumed that the three-dimensional velocity potential is composed of two-dimensional velocity potentials which are obtained by the preceding method at every cross section. And using Bernoulli's equation, the hydrodynamic pressure and the hydrodynamic force are obtained. Pitching motions, heaving motions and shearing forces at SS. 7 1/2 in regular head waves are calculated by present method. As for the fundamental frequency component, the agreement between experimental results and calculated ones is poor. But, through the correction of forward speed and three-dimensional effects which are not taken into account exactly in calculated results, calculated results shows quite good agreement with experimental ones. As for the bi-harmonic components, the agreement between them is fairly good.