《正義與微笑》是1942年6月太宰治所發表的第二本長篇小說。這個時期已成為當時文壇中堅作家的太宰治，在其創作上應用了許多的新創作方法。而《正義與微笑》正是借用了當時一名青年堤康久的日記所改寫而成的「日記體小說」。這部小說常被人跟太宰治的實際人生相提並論。一般而言，太宰治的作品由於常以自身的經歷或身家背景作為題材，所以常會被拿出來與作者本身的人生經歷相做比較。但像《正義與微笑》這樣的作品，是以別人的日記作為小說的題材，卻還是被拿來與太宰治的實際人生做對照一定有其理由。本論文將先分析被稱做是「日記體小說」的《正義與微笑》之作品構造，特別是去闡明其作品最後所附加的「後記」的意涵。接著分析作品中主人翁與「家」及「兄長」的關連，透過作品構造及作品內容的分析，說明《正義與微笑》的構造，且釐清其常被與作者實際人生做連結的理由。
＂Justice and Smile＂ is the second newly written full-length novel Dazaiosamu published in June, 1942. Dazaiosamu was being able to implement varieties of writing techniques and had become a significant writer during that time. ＂Justice and Smile＂ is written in diary format based on a young man's diary. People often compare this novel with Dazaiosamu's true life. In fact, Dazaiosamu usually wrote books based on his own experience and his life. Hence, his work is often being compared with his true stories in life. However, ＂Justice and Smile＂ is written based on someone else's diary and still being mentioned about Dazaiosamu's own experience has its reason. This research will analyze the structure of diary format, specifically on the meaning of the epilogue. Next, analyze the relationship among the main character, home and the brotherhood. Through analysis of the book's structure and content, this research will clarify the reasons why people usually connect the author's real life and the book itself.
