Ame-no-Ohabari (, Old Japanese Ame-nö-Opobari) is a legendary Japanese sword. that roughly translates to "Heaven-Point-Blade-Extended". It is primarily found in the mythology of Izumo Province. It is a Totsuka-no-Tsurugi "Sword of Length of Ten Fists", which seems to be distinguished by its length and being a tsurugi (straight, double-bladed sword).
Wielded by the male creator deity Izanagi, this blade is used to cut up the infant Kagu-tsuchi after his birth burns Izanami, his mother, to death. It cuts the Fire God into multiple pieces, creating eight volcano-gods. When blood drips from the blade afterwards, the sea kami Watatsumi and the rain kami Kuraokami are formed.
The name of the ten-fist sword wielded by Izanagi is given postscripturally as , otherwise known as Itsu-no-ohabari.
In the Kojiki chapter on the conquest of Izumo, the heavenly deities Amaterasu and Takamimusubi decreed that either Takemikazuchi or his father ("Heaven-Point-Blade-Extended") must be sent down for the conquest. Itsu-no-owabari, who previously appeared as a ten-fisted sword, here has the mind and speech of a sentient god, and he volunteered his son, Takemikazuchi, for the subjugation campaign. Takemikazuchi was accompanied by "Heavenly Bird Boat" (which may be a boat as well as being a god).