Nihondaira Observatory (also known as Oohira Station, Obs.

code: 385) is an astronomical observatory that is located on a hill overlooking Shimizu, Japan.

[1] It has been the source for numerous discoveries of minor planet by astronomer Takeshi Urata.

[1] In 2007, the observatory was ranked 43rd in the number of asteroids discovered, with a total of 163, but has since lost its ranking, as the top 50 discovery sites have all discovered more than 400 bodies as of 2016.

[3] The asteroid 2880 Nihondaira, discovered by astronomer Tsutomu Seki, is named for this observatory.