This study investigated the concentration of coenzyme $Q_{10}$ ($CoQ_{10}$) and $Q_9$ ($CoQ_9$) in 6 commercial vegetable oils commonly consumed in Korea and estimated the average daily intake of $CoQ_9$ and $CoQ_{10}$ from oils selected. The analytical method employed saponification before solvent extraction and quantification using high performance liquid chromatography (HPLC) with a mass spectrometer (LC-MS). Contents of $CoQ_9$ and $CoQ_{10}$ in 6 cooking oils varied from 233.7 to 1.4 and from 84.9 to $1.3;{mu}g/g$ oil, respectively. Maize germ oil was the richest sources of $CoQ_9$ ($233.7{pm}8.2;{mu}g/g$), while $CoQ_{10}$ was found the highest contents in perilla oil ($84.9{pm}7.6;{mu}g/g$). However, the major oil source of CoQ intake in the Korean population was soybean oil (63.0%). The estimated daily intake of total CoQ ($Q_9+Q_{10}$) was 2.92 mg/day/person.