This paper analyzes opinion pieces written by Korean learners of Japanese on the topic of "For or Against Capital Punishment" from the perspective of "concession". The study examines the number of occurrences of concession, the form of expression and what role concession played in each component of the opinion pieces. The results are as follows. 1. Concession appeared in 55 of the 66 opinion pieces (80.3%) at an average rate of 2.14 times per piece. Further, "opposing-theory-related concession" appeared more often than "personal-opinion-related concession". 2. There was a tendency to use "aru", "iru" "to iu" and noun-predicative sentences frequently in "introducing an opposing theory", and to describe objective facts without personal opinion. 3. "Acceptance of an opposing theory" was characterized by "(to)omou" or other thought-related verbs, modal forms and declarative adverbs. 4. "Identifying flaws in one``s own opinion" ended in negative sentences relatively frequently. 5. Negative sentences appeared more often in "negating the comprehensiveness of one``s own opinion" than in 4, in many cases starting with a contradictory conjunction. Considered together with 4, "personal-opinion-related concession" is often used in negative sentences. 6. In each component of the opinion pieces, concession played a role of "introducing and supplementing claims", "emphasizing the validity of the reason or evidence for supporting a claim" or "introducing for repeating claims".