In the past, the prevailing view was that the castle was built in the era of the Gohojo clan based on the evidence of the castle's nawabari (castle plan; general term for the layout of a castle and its component structures), but according to archaeological findings from excavation research the likelihood that the castle was built in the era of the Yamauchi Uesugi family has become much stronger.
従来、城の縄張りの観点から後北条氏の時代に造築されたものではないかとの見方が有力であったが、発掘調査にもとづく考古学的な知見からは山内上杉家時代の城である可能性が非常に強くなってきた。