South Korea’s president, Yoon Suk Yeol, announced on Thursday that he had accepted the resignation of his defense minister, the first member of Mr. Yoon’s cabinet to lose his job since the president’s short-lived declaration of martial law on Tuesday night stunned the country.

The defense minister, Kim Yong-hyun, had tendered his resignation on Wednesday, saying that he considered himself responsible for the crisis that the martial law decree had created for Mr. Yoon’s government. He did not directly address allegations among opposition lawmakers and local media that he had suggested the idea to Mr. Yoon.

A statement from the presidential office said that Mr. Kim would be replaced by Choi Byung Hyuk, a retired army general who has been serving as South Korea’s ambassador to Saudi Arabia.

Mr. Yoon withdrew the martial law declaration early Wednesday morning, after the National Assembly voted unanimously against it and protesters gathered to denounce the move. Opposition lawmakers later introduced a motion to impeach Mr. Yoon, which could be voted on as soon as Friday.

This is a developing story.