In a single piece, the Irk Bitig is the only text that has written in the form of a book in Old Turkic runic alphabet and survives. This book, which was found in the Halls of the Thousand Buddhas near Tun-huang, consists of various ırks (omens). This omen book contains short interpretations of 65 ırks and a colophon. It was written Manichaean “ny” dialect. Namely, the book has Old Uighur dialect characteristics. It is not known when the Irk Bitig exactly has written. The aim of this article is to examine adverbs and adverbial constructions in the Irk Bitig. Therefore, the article consists of three main parts. In the first part, I will dwell on the function of adverbs and adverbials. In the second and third part, I will investigate their structure and meaning.