Usually written in kana. Kanji spelling 道理で
indeed; it's no wonder
Adverb
道理どうりで、君きみが喜よろこぶわけだ。
No wonder you are so happy.
道理どうりで彼かれらが彼女かのじょの申もうし出でを断ことわったわけだ。
No wonder they turned down her offer.