The Harushio is called a 3rd generation submarine, and uses complete double shell system and a tear drop type hull. The silhouette is similar to the Yushio type, but there is a projection section of the countermeasure intelligence sonar where it differs in the appearance extending to the bow top that makes it is possible to distinguish them. The hull was extended about 1 meter in total length attendant upon inside of warship space enlargement in comparison with the Yushio type. It is technically derived from the previous Yushio class, but silent running characteristic are strengthened and there are some improvements in underwater capability.