noun
sworn statement; affidavit
Legal term for a written statement confirmed by oath, used in court or official procedures.
裁判所に宣誓陳述書を提出した。
I submitted a sworn statement to the court.
陳述書 is a general written statement, while 宣誓陳述書 specifically refers to one made under oath.
Compound of 宣誓 (oath) + 陳述 (statement) + 書 (document).