However, since he had no economic base (the Ononomiya family has been driven to economic ruin because his grandfather Sanesuke left little property to the adopted son Sukehira (Sukefusa's father) and he left his property to his biological daughter and her husband FUJIWARA no Kaneyori (a son of FUJIWARA no Yorimune, a nephew of Yorimichi and Yoshinobu)), he could not secure enough political power to oppose Yorimichi.
しかし、経済的基盤を持たない（祖父実資は、養子であった資房の父・資平に財産を殆ど与えずに実娘とその夫・藤原兼頼（藤原頼宗の子、頼通・能信の甥にあたる）に与えてしまったために、小野宮家は経済的に没落の一途を辿っていた）ため、頼通に対抗できるだけの政治力を確保できることが出来なかった。