This study investigated bias of coverage photos of newspapers, analyzing how three major daily newspapers, Chosun Ilbo, Seoul Shinmun, and Hankyoreh Shinmun, depict the candidates of the ruling party and the opposition party during the 18th presidential election held on 19 December 2012. First, 666 coverage photos related with the election were sampled to set the population, using content analysis method. This study adopted Verser and Wicks`s framework, modified and complemented, as the suitable research method to analyze contents of coverage photos. The analysis period included the pre-election period and the deadline of candidate registration. According to the study results, Hankyoreh Shinmun published 299 of 666 coverage photos while Seoul Shinmun and Chosun Ilbo published 189 and 178. Analyzing the page configuration of photos, the frequency of photos of the special page was highest. Second, there were no significant differences between the interaction favorability of two candidates in the case of Seoul Shinmun. Chosun Ilbo, however, used photos twice as favorable to the ruling party candidate as to the opposite party candidate while Hankyoreh Shinmun published photos twice as favorable to the opposite party as to the ruling party. Third, three newspapers published 349 photos of the event that had become politcally important: Chosun Ilbo dealing with 99, Seoul Shinmun 104, Hankyoreh Shinmun 146. In conclusion, this study found that Chosun Ilbo leaned toward the ruling party candidate, as Hankyoreh Shinmun toward the opposite party candidate, in terms of both quantity and quality of photos, especially with gesture, interaction, facial expression and gaze of the candidate, and props and angles of photos. Seoul Shinmun maintained neutral in both quantity and favorability of coverage photos. It was to be analyzed that these differences came from political bias of newspapers.