Keirin-in Ihaibyo mausoleum is located to the northwest of Arima graveyard, and was the final Arima mausoleum constructed. It enshrines the second-generation feudal lord, Tadayori, and according to the inscription on the stone monument, was constructed in around 1655. Like the other mausoleums, the roof is an irimoya-style gabled roof but it is thought that the style was changed during repairs and that the original was a pyramidal hogyo-zukuri roof. Inside the mausoleum is a miniature kuden shrine which is a replica of Shunrin-in Ihaibyo that enshrines Tadayori under his Buddhist name, Keirin-in. After Keirin-in Ihaibyo, there were no further mausoleums constructed.  The feudal lords that came after received sekito stone monuments for their memorial services instead.