The Chi-Nu retained the same chassis and suspension of the Type 1 Chi-He, but with a new large hexagonal gun turret and a commander's cupola. The Type 3 75 mm tank gun was one of the largest guns used on Japanese tanks. The thickest armor used was 50 mm on the front hull; it also had 25 mm on the turret, 25 mm on the sides and 20 mm on the rear deck.
The Chi-Nu kept its chassis and suspension from the Type 1 Chi-He but added a new large hexagonal gun turret and a commander's cupola. The Type 3 75 mm tank gun was one of the largest guns used in Japanese tanks. The thickest armor on the Chi-Nu was 50 mm on the front hull, with 25 mm on the turret, sides, and 20 mm on the rear deck.