円買い介入、過去最大　１０月２１日、５兆６２０２億円

　財務省が７日発表した昨年１０～１２月期の為替介入実績によると、政府・日銀は１０月２１日に円買い・ドル売りで１日当たり過去最大となる５兆６２０２億円の介入を実施した。介入は直ちに実施の有無を公表しない「覆面」の形で行われており、今回実施日と介入規模が明らかになった。
　覆面で介入を実施したのは１０月２１日と２４日の２日間だった。２４日の円買い介入額は７２９６億円で、期間中の介入額は合計６兆３４９９億円に上った。覆面介入には市場に疑心暗鬼を生み、一方的な取引を逡巡（しゅんじゅん）させる効果があるとされる。
　覆面介入した１０月２１日は海外市場で１ドル＝１５２円に迫る勢いで円安が加速していたが、介入後に円相場は急騰。一時、一部の電子取引で１４４円台を付けたとみられる。２４日も１４９円台から１４５円台に円高方向へ振れる場面があった。（2023/02/07-11:35）

Japan spent 5,620.2 billion yen in a foreign exchange market intervention on Oct. 21 last year, a daily record high for the country's yen-buying operations, a Finance Ministry report showed Tuesday.
   As the Japanese government and the Bank of Japan carried out the large-scale operation in the form of a "stealth" intervention, meaning authorities do not immediately confirm whether they have stepped into the market, the ministry revealed its date and size for the first time in the latest report on interventions conducted between October and December 2022.
   During the reporting period, stealth interventions were conducted on two days--Oct. 21 and Oct. 24. Japan spent a total of 6,349.9 billion yen for interventions in the three-month period.
   Such secret interventions are believed to create suspicion among market players and make them hesitant to take any unilateral moves in currency trading, according to people familiar with the matter.
   On Oct. 21, the dollar climbed to approach the 152-yen line in overseas trading, but then rapidly fell following the intervention, with the U.S. currency believed to have briefly dropped to around 144 yen in some electronic trading.