Alphitobius diaperinus Panzer, 1797 is a major pest in poultry production and easily observed in poultry litter. We have determined mitochondrial genome of A. diaperinus collected in Chungcheongbuk-do, Republic of Korea. The circular mitogenome of A. diaperinus is 15,511 bp long which is longer than that of Z. atratus but shorter than that of T. obscurus. It includes 13 protein-coding genes, two ribosomal RNA genes, and 22 transfer RNAs. The base composition was AT-biased (72.4\%). Phylogenetic tree displays that tribe Alphitobiini is clustered with tribes Helopini and Diaperini with enough supportive values of three phylogenetic trees.