Arima Shigenori served as a bushō for the Arima clan in Settsu Province.
The Settsu-Arima were an illegitimate lineage of the Akamatsu clan of Harima Province. The clan name originated from the Arima District that the clan governed in Settsu.
Shigenori was a member of a cadet family. In the era of his father, Arima Norikage, the clan resided in Sanda Castle; however, in the era of Shigenori, the clan transferred its domain to Miki in Harima, moving their base from Sanda Castle to Mitsuta Castle. This was located in the territory of Bessho Nariharu, leading to frequent clashes. In 1554, Shigenori participated in an expedition led by Miyoshi Nagayoshi to subjugate the Bessho. During this campaign, he captured Ōgo Castle from the Bessho and moved in, but an effort to topple Nariharu’s base at Miki Castle failed. In 1558, the Bessho recaptured Ōgo Castle. Shigenori died either during the loss of Ōgo Castle or later during the Eiroku era (1558-1570) in connection with an internal rebellion within the Miyoshi clan.