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The octopus stone, Taiko-ishi 蛸石 (also called "Drum Rock") is a large stone at Osaka Castle in Japan. The stone is near Sakura Gate. It is one of the largest of several megaliths at the castle (by face area), at 5.5×11.7 meters and over 120 tonnes (130 tons). Its name is derived from the octopus shape visible on its lower left corner.
- 大阪城歴史散策 [Exploring the history of Osaka Castle], Hoikusha, 1992, ISBN 9784586508310
- Lee, Chang-kook (1993), "Before Osaka Castle", Asian Pacific Quarterly, Cultural and Social Centre for the Asian and Pacific Region, 25-26
- Schmorleitz, Morton S. (1974), Castles in Japan, Tuttle
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