書斎|しょさいshosai[0]heiban (flat)

1. nounstudy; library; den; home office; reading room
   このドアは書斎しょさいに通つうじている。↗

   This door leads to the study.

• Synonym書房しょぼうNeutralCan mean a study, but today mostly appears in bookstore and publisher names such as 「〇〇書房」.
• Synonym書室WrittenA written word for a study, but very rare; say 「書斎」 instead.
• Related文房ぶんぼうWrittenWritten register: a room for reading and writing, but rarely used alone in modern Japanese; best known from 「文房具」.

Use 「書斎」 for a room at home where you read and write. 「文房」 and 「書室」 are written, rarely used alternatives; 「書房」 now mostly names bookstores and publishers, as in 「〇〇書房」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 主おもに読書どくしょや書き物かきものをするための部屋へやや空間くうかん。