Pod dehiscence or shattering is an agronomic character of importance in breeding soybeans adaptable to machinery cultivation. Caviness (1969) had presented heritability estimation of pod dehiscence in four crosses between varieties in the United States and the wild soybean, and the values in broad sense in F2 generation were very high (over 90%). The author (Nagata, 1974) has reported results of observations of pod dehiscence under 40 different conditions with special regard to the moisture contents of plant parts, especially of seeds, and concluded that pod dehiscence was affected greatly by environment and year with reference to the meteorological conditions.