The Nirayama daikansho (韮山代官所) was an Edo period government administrative center for the tenryō territories in eastern Japan during the direct control of the Tokugawa shogunate.

However, unlike the daimyō, they were not subject to the sankin kōtai requirement, but alternated residence between Edo in summer and Nirayama in winter.

However, in 1723, Egawa Hidekatsu was found guilty of embezzling public funds intended for repairs to the Tōkaidō at Totsuka-juku and was relieved of his office.

The clan regained the post in 1758; however, its scope of authority after this date was limited only to Izu Province, which it continued to govern until the Meiji restoration.

In the Bakumatsu period, Egawa Hidetatsu played leading role in the shogunate's efforts to modernize its military against the threat posed by the Western imperialist powers, and was responsible for the construction of the nearby Nirayama Reverberatory Furnace for the production of cannons.