In the case where a detainee is unable to bear the costs required for sending a letter, if the director of the immigration detention center, etc. finds it appropriate in light of the purpose of sending it, the whole or part of those costs is to be borne by the National Treasury.
Read this with the articles around it
detaineemachine translation
「被収容者」
A person held in an immigration detention center or other immigration detention facility.
Defined inArticle 55-4, paragraph (1)· applies only in this chapter and in Article 71-6
director of an immigration detention center, etc.machine translation
「入国者収容所長等」
The director of an immigration detention center or the director of a regional immigration services bureau.
Short name set inArticle 55-5, paragraph (1)· applies only in this chapter and in Chapter 8