Causative Causee: に vs を

When English says "I made the child walk" and "I made the child drink the medicine," the child is marked identically both times — it is just the object of made. Japanese does not have that luxury. The causative (使役, しえき) turns one verb into a two-participant event: the causer (the one who makes or lets it happen) and the causee (the one who actually performs the action). The question this page answers is a single, deceptively small one: which particle marks the causee — に or を? Getting it wrong produces sentences that are ungrammatical, not just unnatural, so it is worth pinning down precisely.

If you have not yet met the causative form itself (食べる → 食べさせる, 書く → 書かせる), read the causative overview first; this page assumes you can already build させる and せる forms and focuses only on marking the causee.

The core rule follows from transitivity

The entire に/を decision falls out of one prior fact: is the underlying verb transitive or intransitive? (If that distinction is shaky, see transitivity.) The logic is mechanical:

The deep principle is that a single clause tolerates only one を. When the base verb is intransitive, there is no object competing for を, so the causee can take it. When the base verb is transitive, the object has first claim on を, and the causee is pushed onto に. The particle is not chosen for its meaning first and its grammar second — grammar sets the outer boundary, and only inside that boundary does meaning get a vote.

Intransitive verbs: the causee normally takes を

With an intransitive verb, nothing else wants を, so the causee slides right into it. This is the prototypical causative pattern learners meet first.

Notice 泣く (to cry) is intransitive — you do not "cry something" — so 泣かせる takes its causee with を: 娘（むすめ）を泣かせた ("made my daughter cry"). This same を-causee is what lets Japanese talk about causing an emotional reaction: 笑わせる ("make laugh"), 困らせる ("cause trouble for"), 喜ばせる ("make happy") are all built on intransitive roots and all take を.

Transitive verbs: the causee must take に

The moment the base verb is transitive, its object seizes を and the causee has nowhere to go but に. There is no choice here — it is forced by the one-を limit.

Here 漢字 (the thing written) takes を, so the causee 学生 (the ones doing the writing) takes に. Try to give the causee を as well and the sentence collapses. The same pattern governs 飲ませる, 洗わせる, 食べさせる, and every other transitive causative:

The subtle part: with intransitive verbs, に and を both work — and they mean different things

Here is where most explanations stop too early. With an intransitive verb, を is available for the causee, but so is に — and the two are not interchangeable. The choice is a dial for how much will the causee is granted:

• を-causee → coercion, direct control. The causer imposes the action; the causee's own preference is irrelevant or overridden.
• に-causee → permission, autonomy. The causer allows or enables; the causee is a willing participant with some agency.

The classic minimal pair:

The first, with を, frames the parent as sending the child — the child's wishes do not enter into it. The second, with に, frames the parent as permitting — the child wanted to go, and the parent said yes. English collapses both into "make/let the child go" and disambiguates only with a different verb (send vs let); Japanese carries the difference in a single particle. This feeds directly into the make-vs-let distinction: を pulls toward "make," に pulls toward "let."

So when the brief mentions 部下（ぶか）に残業（ざんぎょう）させた, the に is doing quiet work: because 残業する ("work overtime") is intransitive, を would have been available, and choosing に softens the framing from "I forced overtime on my subordinate" toward "I had my subordinate stay late." The を version, 部下を残業させた, sounds more baldly coercive.

Why English speakers get this wrong

English marks the causee the same way every time — always the direct object of make/let/have/get: "I made him walk," "I made him drink it." There is no re-routing, no object-collision to resolve, and no permission-vs-coercion particle. So the two habitual errors both come straight from English:

1. Defaulting to を everywhere, because English's causee always looks like an object.
2. Producing two を in one clause, because the causee ("him") and the object ("it") are both objects in English — but Japanese forbids the double を.

Common mistakes

That last pair is not about grammar — both are grammatical — but about the dial. With an intransitive verb like 休む, using を when you mean "let / allow" misreports your intent as "force."

Key takeaways

• The causee's particle is decided first by the one-を-per-clause limit.
• Transitive base verb → the object takes を, so the causee is forced onto に. No exceptions, no dial.
• Intransitive base verb → を is free, so the causee normally takes を; but に is also possible, and there the particle becomes a meaning dial.
• On that dial, を = coercion/direct control ("make, send"), に = permission/autonomy ("let, allow") — the grammatical heart of the make-vs-let contrast.
• Never write two を in one causative clause; that is the number-one transfer error from English.