In this Act, the meanings of the terms stated in the following items are as prescribed respectively in those items:
この法律において、次の各号に掲げる用語の意義は、それぞれ当該各号に定めるところによる。
the term "official passport" means a passport issued to a person who travels to a foreign country to engage in the official duties of the national government, and their spouse, children, or employees whom the person accompanies when they travel abroad, or who are summoned to their location after they go abroad;
公用旅券 国の用務のため外国に渡航する者及びその者が渡航の際同伴し、又は渡航後その所在地に呼び寄せる配偶者、子又は使用人に対して発給される旅券をいう。
the term "ordinary passport" means a passport other than an official passport;
一般旅券 公用旅券以外の旅券をいう。
the term "heads of each ministry and agency" means the President of the House of Representatives, the President of the House of Councillors, the Chief Justice of the Supreme Court, the President of the Board of Audit, and the Prime Minister and the Ministers of each ministry, who are the heads of each ministry and agency (meaning the House of Representatives, the House of Councillors, the court, the Board of Audit, the Cabinet (excluding the Cabinet Office and the Digital Agency), the Cabinet Office, the Digital Agency, and each ministry; the same applies below) to which the person who travels from Japan to a foreign country using an official passport belongs (when the person is a person accompanied by or is summoned as a spouse, child, or employee, the person who accompanies or summons that person); provided, however, that when the person does not belong to any ministry or agency, the Minister for Foreign Affairs is the head person;
各省各庁の長 本邦から公用旅券によつて外国に渡航する者（その者が同伴され、又は呼び寄せられる配偶者、子又は使用人である場合には、その者を同伴し、又は呼び寄せる者）が所属する各省各庁（衆議院、参議院、裁判所、会計検査院並びに内閣（内閣府及びデジタル庁を除く。）、内閣府、デジタル庁及び各省をいう。以下同じ。）の長たる衆議院議長、参議院議長、最高裁判所長官、会計検査院長並びに内閣総理大臣及び各省大臣をいう。ただし、その者が各省各庁のいずれにも所属しない場合には、外務大臣とする。
the term "travel document" means a travel document prescribed in Article 19-3, paragraph (1);
渡航書 第十九条の三第一項に規定する渡航書をいう。
the term "prefecture" means the prefecture that has jurisdiction over the locality of the domicile or residence of a person who travels from Japan to a foreign country using an ordinary passport;
都道府県 本邦から一般旅券によつて外国に渡航する者の住所又は居所の所在地を管轄する都道府県をいう。
the term "prefectural governor" means the governor of a prefecture prescribed in the preceding item; and
the term "holder of a passport" means a person who has been issued with a passport.
旅券の名義人 旅券の発給を受けた者をいう。
Read this with the articles around it