郵便箱 ゆうびんばこ Meanings Noun mailbox (for delivered mail); letter box mailbox (for outgoing mail); postbox Kanji 郵 mail. Read as ユウ. 便 mail. Read as ビン. 箱 box. Read as はこ. Example sentences はがきにこの切手を貼って郵便箱に投函しなさい。Put this stamp on the postcard and drop it in the mailbox. 彼が帰宅すると郵便箱に手紙が入っていた。Upon returning home, he found a letter in the mailbox. Jinuma: Japanese Dictionary · Word lists