理系

• 読み: りけい
• ローマ字: rikei
• 漢字の分解: 理 (science/reason) + 系 (system/stream) → science stream
• 発音: /ɾi.keː/

意味

Science and engineering track — the other half of Japan's arts-versus-sciences academic divide.

理系 covers all STEM fields: physics, chemistry, biology, engineering, mathematics, computer science, and medicine. 理系 students are stereotyped as logical but socially awkward, buried in lab reports, and chronically sleep-deprived. The 理系 path typically involves longer hours, mandatory lab work, and a higher rate of graduate school advancement. In the job market, 理系 graduates are often considered more employable in technical fields, creating a perceived advantage over 文系 counterparts.

例文

1. 理系は実験レポートがえぐいって聞いてたけどマジだった。
2. 理系だと院進するのが当たり前みたいな空気がある。
3. 理系男子は恋愛に疎いってステレオタイプやめてほしい。

使い方ガイド

場面: university, school, career, daily conversation

トーン: identity-defining, proud or self-deprecating

正しい言い方

• 理系は忙しいけどやりがいある。 (The science track is busy but rewarding.)
• 理系だと企業の推薦枠あるからちょっと就活楽。 (As a science student, there are company recommendation slots so job hunting is a bit easier.)

避ける言い方

• 「理系だからコミュ障でしょ」は偏見 (Assuming a science student has poor social skills is prejudiced)

よくある間違い

• Thinking the 文系/理系 divide is just about university major — in Japan it shapes identity, stereotypes, and social dynamics far beyond academics

起源と歴史

Abbreviation of 理科系 (science/natural science division). Paired with 文系, this binary classification has structured Japanese education since the Meiji era and remains a fundamental social category.

文化的背景

時代: Meiji-era education system, deeply embedded since the 20th century

世代: All ages (universally understood)

社会的背景: Universal in Japanese academic and professional culture

地域メモ: Used across all of Japan. '理系女子' (rikei joshi / science girls) has become a specific cultural category promoting women in STEM.