“〜taru (mono)”: As a 〜, One Ought To (written/aphoristic) [JLPT N1]

Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026

「親たる者は子供の模範となるべきだ」 — the conduct expected of someone in a given position.

「教育者たる者、常に学ぶべし」 — one who is a ～ ought to …

In aphorisms and admonitions, to stress how a certain status ought to be, a literary pattern is used — 「リーダーたる者、部下の模範であれ (one who is a leader, be a model to your subordinates).」 「〜たる」 = being ～, as ～ (literary, aphoristic). It's the literary version of 「である,」 mostly in the form 「〜たる者（もの）,」 stressing a status's due responsibility, bearing. This guide clarifies its use, its aphoristic register, and separating it from the neutral 「である」「としての.」

Core: being ～, as ～ (a literary assertion, mostly a status's due bearing)

「noun ＋ たる（＋noun）」 means “being ～, as ～, holding the position of ～” — it's the attributive form of the literary copula 「たり,」 equal to the literary version of 「である,」 mostly to stress a status's due responsibility, bearing, qualification:

• 教育者たる者は、常に学び続けねばならない (one who is an educator must keep learning always).
• 一国の代表たるにふさわしい風格 (a bearing befitting a national representative).
• 王者たる貫禄を見せつけた (displayed the dignity of a champion).

Feel: the core is “being／as ～ (this status, position),” the literary, aphoristic, solemn version of 「である.」 It most often appears as 「〜たる者（もの）,」 stressing “one who is a ～ (ought to ～),” with an admonitory, aphoristic feel (see 〈たるもの〉). It's also used in “AたるB” for “the B that A ought to be.” In English: being ～, as ～, holding the position of ～ (as one ought).

Forms & attachment

Examples in context

• 医師たる者、患者の命を第一に考えるべきだ。(One who is a doctor should put the patient's life first.)
• 大国たるにふさわしい責任が問われる。(A responsibility befitting a great power is demanded.)
• 彼には、王者たる風格が備わっている。(He has the bearing of a champion.)
• 親たる者、子の手本でなければならない。(One who is a parent must be a model to the child.)
• プロたる以上、結果で示すしかない。(Being a professional, one can only prove it by results.)

⚠️ Where learners slip up

① 「たる」 = the literary 「である」 (being, as); mostly 「〜たる者」 for a status's due bearing. This is the key to understanding. 「たる」 is the attributive form of the literary copula 「たり,」 meaning the modern 「である」 (is, as). So 「教育者たる者」 = 「教育者である者」 = “one who is an educator.” It most often appears as 「〜たる者（もの）,」 stressing “one who is a ～, (ought to ～),” followed by the responsibility, bearing, attitude due to that status (〜べきだ／〜であれ／〜なければならない): リーダーたる者、決断力を持て (one who is a leader, have decisiveness). Test: on seeing 「〜たる（者）,」 read it as “being ～, as ～ (as one ought)” (= the literary である), mostly to stress a status's responsibility.

② Precedes a noun (status, position); a written, aphoristic, solemn expression. In attachment, 「たる」 precedes a noun, mostly of status, position, qualification (教育者, リーダー, 王者, 紳士, 親, プロ, 大国). It's a highly literary, aphoristic, solemn expression, with an admonitory, declarative feel, mostly for aphorisms, precepts, editorials, formal speeches. Everyday speech never uses it — for “as a teacher” everyday uses 「先生として,」 not 「先生たる」 (which sounds like reciting classical text). Test: in aphorisms, precepts, formal speeches stressing a status's responsibility → たる（者）; for everyday “as ～” → use として.

③ Separate it from 「である」 — たる is literary aphoristic, である is neutral written. They mean the same (both “is, as”), differing in register. 「〜たる」 = being ～, as ～ (literary, aphoristic, solemn): 教育者たる者 (one who is an educator — literary, aphoristic). It's highly literary, solemn, with an aphoristic, admonitory feel. 「〜である」 = is ～, as ～ (a neutral written assertion): 彼は教育者である (he is an educator — a neutral statement). It's the neutral, general written “is,” just plainly asserting. Difference: 「たる」 literary, aphoristic, solemn (stressing a status's responsibility, bearing); 「である」 neutral, general (a plain assertion). Test: to aphoristically, admonishingly stress “being ～ (as one ought)” → たる; to plainly say “is ～, as ～” → である.

④ Separate it from 「としての」 — たる is literary aphoristic, としての is neutral general. Both can express “as a ～,” but differ in register. 「〜たる」 = being ～ (literary, aphoristic, stressing a status's due responsibility, bearing): 紳士たる者 (one who is a gentleman — literary, with an admonitory “ought to”). 「〜としての」 = as a ～ (neutral, general, objectively stating a status／standpoint): 教師としての責任 (responsibility as a teacher — neutrally stating the responsibility of “the teacher status”), 親として (as a parent). It's the neutral, general “as a ～ (status／standpoint),” usable in speech and writing. Difference: 「たる」 literary, aphoristic, with the admonition “being ～ ought to” (教育者たる者); 「としての」 neutral, general, objectively stating a status (教師としての責任). Test: to aphoristically, admonishingly say “being ～ (ought to)” → たる; to neutrally, generally say “as a ～ (status／standpoint)” → としての.

🔄 Compare: たる／である／としての／たるや

💡 Learning tip

「〜たる」 = being ～, as ～ (literary, aphoristic) — three points: ①「たる」 = the literary 「である」, mostly 「〜たる者（もの）」 for “one who is a ～ (ought to ～),” stressing a status's due responsibility, bearing (see 〈たるもの〉); ② precedes a noun (status, position), an aphoristic, solemn expression, everyday “as ～” uses 「として」; ③ separate it from 「である (a neutral assertion)」「としての (a neutral status)」 — たる has an aphoristic, admonitory feel. This pattern has real aphorism, precept weight — 「リーダーたる者、かくあるべし」「教育者たる者、常に学べ」 render, resoundingly, that solemn expectation of “being ～ ought to be ～.” To stress a status's responsibility and bearing in a speech or precept, 「たる者」 has the most stature; for everyday speech, just use 「として.」

❓ Questions you might have

Q: What's the difference between 「教育者たる者」 and 「教育者として」?

The difference is ‘literary aphoristic (with ‘ought to')' vs ‘neutral general (objective status).' 「〜たる（者）」 = being ～ (literary, aphoristic, stressing a status's due responsibility, bearing): 「教育者たる者」 = “one who is an educator (ought to ～)” — a literary, aphoristic, solemn expression, with a clear admonitory, aspirational “being ～ ought to ～” feel, often followed by the responsibility due to that status (〜べきだ／〜であれ): 教育者たる者、生涯学び続けるべきだ (one who is an educator should keep learning for life — with the admonition “ought to”). It's mostly for aphorisms, precepts, formal speeches, solemn and with stature. 「〜として」 = as a ～ (neutral, general, objectively stating a status／standpoint): 「教育者として」 = “as an educator (in that status／standpoint)” — a neutral, general statement of “in some status／standpoint,” usable in speech and writing, without special admonition: 教育者として、責任を感じる (as an educator, I feel responsibility — neutrally stating a standpoint), 親として当然のことだ (it's natural as a parent). Difference: 「たる（者）」 literary, aphoristic, with the admonition “being ～ ought to,” solemn (教育者たる者、〜べきだ); 「として」 neutral, general, objectively stating a status／standpoint (教育者として、〜). Test: to solemnly stress “being ～ (ought to)” in an aphorism, precept, speech → たる者; to neutrally, generally say “as a ～ (status／standpoint)” → として. So to admonish “one who is an educator ought to ～” use 「教育者たる者,」 for everyday “as an educator, I feel ～” use 「教育者として.」

Q: What kind of word is 「たる」? Why does it mean 「である」?

「たる」 is the attributive form of the literary (classical) copula 「たり」, meaning the modern Japanese 「である」 (is, as). In literary Japanese, the assertion “is ～” has two systems, 「なり」 and 「たり」: 「なり」's attributive is 「なる,」 and 「たり」's attributive is 「たる.」 In modern times, the 「たり」 system is largely replaced by 「である／だ,」 surviving only in some literary-residue, aphoristic expressions, of which 「たる」 is one. So 「王者たる風格」 = 「王者である風格」 = “the bearing (befitting) one who is a champion,” 「リーダーたる者」 = 「リーダーである者」 = “one who is a leader.” It's flanked by nouns, = the literary 「である,」 mostly in 「〜たる者」 (one who is a ～, see 〈たるもの〉) to stress a status's responsibility. The same system gives 「堂々たる態度 (a dignified attitude)」「確固たる信念 (a firm conviction)」 — these 「〜たる」 are also 「たり」's attributive (= である／としている), modifying the following noun, with a literary, solemn feel. Test: on seeing 「〜たる ＋ noun,」 read it as the literary expression “= である／as ～ (as one ought)”; it's a written, aphoristic word, not used in everyday speech.

🖊️ Practice Questions (5)

Q1. 「親___者は、子供の模範となるべきだ。」(One who is a parent should be a role model for their children)

(A) として　(B) たる　(C) である　(D) になる

Q2. 「武士___者は、名誉を命より大切にした。」(One who is a samurai valued honor above life)

(A) たる　(B) べき　(C) にとって　(D) として

Q3. 「たる」が表す意味は？

(A) 〜することができる（可能）

(B) 〜という身分・資格の人が持つべき行動や特質を示す（書面・格言体）

(C) 〜したい（希望）

(D) 〜していた（過去進行）

Q4. 「指導者___者の条件について、今日は議論したい。」(Today I want to discuss the qualities of one who is a leader)

(A) として　(B) による　(C) たる　(D) である

Q5. 「たる」が使えない文はどれ？

(A) 先生たる者は公平であるべきだ。

(B) 学生たる者は勉強が本分だ。

(C) 今日たる者は明日になる。（時間→不適）

(D) 社会人たる者は礼儀を守るべきだ。

Answer Explanations

1. (B) たる ── 「親たる者」(one who is a parent), 「子供の模範となるべき」(should be a role model) = たる expressing the requirements of a status/role.

2. (A) たる ── 「武士たる者」(one who is a samurai), 「名誉を命より大切にした」(valued honor above life) = describing a status / aphoristic style → たる.

3. (B) ── たる = expressing "the conduct / qualities that a person of the status or qualification 〜 ought to have"; a written, aphoristic expression.

4. (C) たる ── 「指導者たる者」(one who is a leader), 「の条件」= the requirements of a status → たる (written language).

5. (C) ── 「今日たる者は明日になる」= 「今日」(today) is a time word, not a status / position / qualification, so たる cannot be used (what precedes たる must be a person's status / position / qualification).