Translation guide
In Japanese, the title for the Minister of Defense is 防衛大臣 (Bōei Daijin). This is the standard, official term used in government and media. There is also a less common, more formal variant 防衛相 (Bōei-shō) used mainly in news headlines or official documents.
The cabinet minister responsible for national defense in Japan.
Referring to the defense minister of a country other than Japan.
Use the country name + の + 防衛大臣. This is the standard way to refer to foreign defense ministers.
アメリカの防衛大臣はロイド・オースティン氏です。
The U.S. Secretary of Defense is Mr. Lloyd Austin.
防衛大臣 is the full, standard title used in most contexts. 防衛相 is an abbreviation commonly seen in newspapers and official documents. It is not used when directly addressing the minister.
防衛大臣、本日記者会見。
Defense Minister, press conference today. (headline style)
防衛相、防衛費増額を表明。
Defense Minister announces increase in defense spending. (headline style)
When speaking directly to the Minister of Defense, use 大臣 (Daijin) after their surname, e.g., 田中大臣 (Tanaka Daijin). In very formal settings, 防衛大臣閣下 (Bōei Daijin Kakka) may be used, but this is rare.
Standard, official title for the Minister of Defense in Japan. Used in formal contexts, news, and everyday reference.
防衛大臣が会見を行った。
The Minister of Defense held a press conference.
新しい防衛大臣が任命された。
A new Minister of Defense was appointed.
Abbreviated form often used in news headlines or official documents. Slightly more formal and concise. Not typically used in direct address.
防衛相、米国防長官と会談へ。
Defense Minister to meet with U.S. Secretary of Defense.
The UK Defence Secretary visited Japan.
Literally 'national defense minister'. Used for some countries, especially those where the ministry is called 'Ministry of National Defense' (e.g., South Korea, Taiwan). Less common for Japan itself.
韓国の国防大臣が訪米した。
South Korea's Minister of National Defense visited the U.S.