bibliomaniac

...People who have this hobby are called bibliophiles, and when it reaches an extreme level, they are called bibliomania, and people who are obsessed with it are called bibliomaniacs, which are translated as book-lovers or book-lovers. Readers and book lovers do not necessarily overlap.

*Some of the terminology explanations that mention "bibliomaniac" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…この趣味の持主を愛書家bibliophileと呼び，それが極端に高じた状態をbibliomania，それに取り憑（つ）かれた人間をbibliomaniacといい，愛書狂，書痴などと訳される。読書家と愛書家とは必ずしも重ならない。…

※「bibliomaniac」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報