1The head of a country's cabinet and executive government; in Japan this generally refers to the Prime Minister.
首相は記者会見で経済対策について説明した。
The prime minister explained the economic measures at a press conference.
来週、両国の首相が会談する予定です。
The prime ministers of both countries are scheduled to hold talks next week.
新しい首相が就任してから半年が経った。
Half a year has passed since the new prime minister took office.
首相官邸の前でデモが行われた。
A demonstration was held in front of the prime minister's official residence.