If a detainee injures themselves or inflicts harm on another person, escapes, obstructs the performance of duties of an official of the immigration detention center, etc., or otherwise engages in an act that seriously harms discipline and order at the immigration detention center, etc., or attempts to engage in any of these acts, an immigration control officer may, to the extent judged reasonably necessary, stop the act, restrain the detainee, and take other measures necessary to suppress the act.
If a person other than a detainee falls under any of the following items, an immigration control officer may, to the extent judged reasonably necessary, stop the act, restrain the person engaging in the act, and take other measures necessary to suppress the act:
if the person intrudes into the immigration detention center, etc., damages its facilities, obstructs the performance of duties of an official of the immigration detention center, etc., or is on the verge of engaging in any of these acts;
入国者収容所等に侵入し、その設備を損壊し、入国者収容所等の職員の職務の執行を妨げ、又はこれらの行為を正にしようとするとき。
if the person does not leave the immigration detention center or regional immigration services bureau despite a demand by an immigration control officer;
if the person, at the scene, assists, incites or instigates the escape of a detainee or the obstruction of the performance of duties of an official of the immigration detention center, etc.;
The security equipment necessary for the measures set forth in the preceding two paragraphs is specified by Ministry of Justice Order.
前二項の措置に必要な警備用具については、法務省令で定める。
定義第二条第一項第十三号・法令全体に適用
第六十一条の三の二に定める入国警備官
わかりやすく言うと
入国者収容所と地方出入国在留管理局に置かれる職員で、入国・上陸・在留に関する違反事件の調査、収容令書や退去強制令書による収容・護送・送還、収容施設などの警備などを行う人のことです（第六十一条の三の二）。
定義第二条第一項第十五号・法令全体に適用
法務省設置法（平成十一年法律第九十三号）第三十条に定める入国者収容所
わかりやすく言うと
出入国在留管理庁に置かれる機関で、日本からの退去を強制される人を収容し、送還する事務を行うところです（法務省設置法第三十条）。
定義第二条第一項第十六号・法令全体に適用
入国者収容所又は第五十五条の三第一項の規定により設けられる収容場
わかりやすく言うと
入国者収容所と、地方出入国在留管理局に設けられる収容場をまとめた呼び方です。