In the first report, the authors presented a bending theory of the superstructure with consideration of shear lag effects, and the calculated values by the theory were compared with the experimental results obtained by the bending test of the box-typed ship models with a good agreement, even in the case of comparatively shorter deckhouse. This theory can be easily applied to the simple structure which has constant cross section and constant stiffness factor of the upper deck, but it is difficult to apply it to the actual ship structure whose cross section and stiffness factor of the deck vary irregularly along the length, therefore, to find the method which can be easily applied to the actual ship, we determined the effective cross sectional area and the effective moment of inertia of the simple superstructure, and using these values, we introduced an approximate method for the bending calculation of the superstructure and its numerical values were compared with the experimental results.