Iran closes the Strait of Hormuz amid rising tensions with the U.S.

米国との緊張が高まる中、イランがホルムズ海峡を封鎖。

更新日: 2026年6月11日 12:50

On June 11, 2026, tensions in the Middle East reached a critical peak as Iran announced the complete closure of the Strait of Hormuz.

2026年6月11日、イランがホルムズ海峡の完全封鎖を発表したことで、中東の緊張は危機的な頂点に達した。

nounJune 11, 2026

nounMiddle East

nounIran

verbannounce

nounStrait of Hormuz

Following U.S. airstrikes on military targets in southern Iran, the Islamic Revolutionary Guard Corps declared the waterway off-limits to all maritime traffic, warning that any vessels attempting to pass would be fired upon.

イラン南部の軍事標的に対する米軍の空爆を受け、イスラム革命防衛隊は当該水域を全ての海上交通に対して立ち入り禁止と宣言し、通過を試みるいかなる船舶に対しても発砲すると警告した。

nounairstrike

nounIran

adjectivemaritime

This development marks a significant escalation in a conflict that has been simmering since February 2026.

この事態は、2026年2月以来くすぶり続けてきた紛争の重大な激化を意味している。

nounescalation

nounconflict

Despite Iran's bold claim, the United States Central Command (CENTCOM) rejects the notion of a total blockade.

イランの大胆な主張にもかかわらず、米軍中央軍（CENTCOM）は全面封鎖という概念を否定している。

nounIran

While Iran has frequently threatened to close the Strait in the past as a strategic deterrent, the current situation is distinct due to the active, ongoing combat operations between the two nations.

過去にもイランは戦略的抑止力として海峡封鎖を頻繁に示唆してきたが、今回の状況は両国間で現在進行中の活発な戦闘作戦が行われている点で異なる。

nounIran

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チャレンジモード

理解度チェック

What reason did Iran provide for closing the Strait of Hormuz?

A scheduled maintenance operation for underwater infrastructure.

It was a direct response to recent U.S. military strikes in southern Iran.

The discovery of a major oil spill in the Persian Gulf.

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正解

It was a direct response to recent U.S. military strikes in southern Iran.

How has the United States responded to Iran's announcement?

CENTCOM maintains that the Strait remains open and that commercial shipping continues.

The U.S. has declared a full-scale ground invasion of the Iranian mainland.

The U.S. has officially recognized the closure to ensure the safety of its citizens.

答えを見る

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正解

CENTCOM maintains that the Strait remains open and that commercial shipping continues.

Why is the Strait of Hormuz considered strategically important?

It handles approximately 20% of global oil consumption.

It is the primary location for international diplomatic summits.

It serves as the main route for undersea fiber-optic cables for the region.

答えを見る

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正解

It handles approximately 20% of global oil consumption.

What distinguishes the 2026 crisis from previous threats made by Iran?

It involves active, ongoing combat operations and military strikes between the two nations.

Previous threats were made via the United Nations rather than the IRGC.

This is the first time Iran has ever threatened the passage of oil tankers.

答えを見る

✓

正解

It involves active, ongoing combat operations and military strikes between the two nations.

What alternative do Gulf producers have if the Strait is unavailable?

They can transport all oil through newly built high-speed railways.

They can use land-based pipelines, although these have limited capacity.

They have shifted entirely to exporting refined electricity.

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✓

正解

They can use land-based pipelines, although these have limited capacity.

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