Compared with the Shitenno-zo (Image of the four guardian kings) of Todai-ji Kaidan-in, which is known as a masterpiece of molding, they are formed with a little emphasis on formality including kacchu (armor); therefore, they are believed to have been made later in the period than the images of Todai-ji Temple.
同じ塑造の傑作として知られる東大寺戒壇院の四天王像の造形と比較すると、甲冑など、やや形式を重視した形で造形されており、東大寺像よりも時代が少し下ると見られている。