Tank experiments for a destroyer model have been carried out at Meguro Model Basin to investigate the longitudinal bending moments in regular waves. This paper describes the test procedure, test results, and some conclusions. The hull of the model, 8 m long, was made of wood and separated in eight blocks at seven sections. Each block of the hull, 1 m long, was jointed by a steel girder whose longitudinal bending rigidity was similar with the actual ship. Bending moments at seven sections were obtained by measuring the bending strains on the steel girder by means of resistance strain gages. Tests were made in regular waves having heights of h/L =1/50, 1/30 and 1/20, and lengths of λ/ L =0.6, 0.8, 0.9, 1.0, 1.1, 1.2, 1.5, 2.0 and 3.0.