同疑城胎宮。為胎生者之宮殿，故云胎宮。為七寶宮中之胎生，故云宮胎。見疑城胎宮條。觀經定善義曰：「雖得往生，含華未出，或生邊地，或墮宮胎。」
The palace-womb, where those who call on Amitābha but are in doubt of him are confined for 500 years, devoid of the riches of Buddha-truth, till born into the Pure Land; idem 疑城胎宮.