was a Japanese feudal domain of the Edo period Tokugawa shogunate, located in Nukata District Mikawa Province (part of modern-day Aichi Prefecture), Japan. It was centered on what is now part of the city of Okazaki, Aichi.
à Âoka Tadasuke, the famous magistrate who had served the 9th Tokugawa shà Âgun, Tokugawa Yoshimune, and who had successfully carried out the Kyà Âhà  Reforms received an additional 4,000 koku in revenue on his promotion to sà Âshaban in 1748. This put him over the 10,000 koku requirement to be styled as daimyà Â, and he received the newly created fief of Nishi-à Âhira as his domain. However, he never relocated to his new territory, and resided in Edo to his death in 1757.
Nishi-à Âhira Domain was not a single contiguous territory, but consisted of several widely scattered holdings: in addition to 12 villages in Nukata District, the territory consisted of 5 villages in Kamo District, 5 villages in Hoi District, 2 villages in Omi District in Mikawa, 3 villages in Ichihara District, Kazusa Province and the original 2 villages of the à Âoka clan in Kà Âza District, Sagami Province.
The domain was inherited by à Âoka Tadasuke's heirs after his death, but it was not until 1748, during the tenure of his grandson, à Âoka Tadatsune, that a jin'ya fortified residence was built in Nishi-à Âhira to be the nominal capital of the domain. Due to its special relationship with the Tokugawa shogunate, the à Âoka clan was one of the few clans exempted from the sankin kà Âtai regulations, and lived in their Edo residence full-time. The graves of all of the daimyà  of Nishi-à Âhira are located at the à Âoka clan temple of Jà Âken-ji in Chigasaki, Kanagawa.
During the Bakumatsu period, Nishi-à Âhira remained loyal to the Tokugawa shogunate, but after the Battle of TobaâÂÂFushimi in the Boshin War, capitulated to the new Meiji government. After the abolition of the han system in July 1871, it became âÂÂNishi-à Âhira PrefectureâÂÂ, which later became part of Aichi Prefecture.
The domain had a population of 6,945 people in 1709 households per an 1869 census. It maintained its Edo residence kamiyashiki in Sakuradamon.
The Nishià Âhira Domain (西大平è©) is a domain that is located in Nishihata Village, Hekikai County, Mikawa Province (Kosai-cho, Hekinan City, Aichi Prefecture). The head clan of the lord of the domain was the lord of Nishibata Village since the Edo period. The Honda clan, ruled Ina Castle in Hoi County, Mikawa Province during the Sengoku period. Honda Tadatsugu, who served Tokugawa Ieyasu as the lord of Ina Castle, adopted Honda Yasutoshi, the second son of Sakai Tadatsugu and the daughter of Matsudaira Kiyoyasu (Princess Usui), as his mother and succeeded him.
In the Siege of Osaka in 1615, Tadasuke went to the front with his father Yasutoshi the lord of the Nishio Domain with 20,000 koku. His father Yasutoshi was transferred to Zeze Domain in 1617.
In 1630, 1,500 koku was added and 1000 koku was added in Kozuko and Shimotsuke Province, and a total of 9,000 koku was acquired. In February 1869, Tadayuki reformed the domain administration organization and established the Legislative and Political Bureau, Accounting Bureau, Military Affairs Bureau, School Bureau.
On July 14, 1871, the Nishibata Domain was abolished due to the abolition of feudal domains and the establishment of prefectures, and the West End Prefecture was established. Due to the integration of prefectures at the end of the same year, the domain was abolished and incorporated into Nukata Prefecture and eventually was incorporated into Aichi Prefecture.