に is the hardest-working particle in Japanese. It appears in sentences about where something is, when it happens, where someone is going, who receives something, why someone set out, who did something to you, and what you turned into. Beginners often meet these one at a time and file them as seven unrelated rules. They are not unrelated. Every use of に marks a fixed point — a target, endpoint, or point of contact — in space, in time, or in some more abstract sense. Hold on to point, and に stops being a list to memorize and becomes a single idea.
This page is the map. Each use gets a clear example and a pointer to its own dedicated page.
The core sense: a point, not a domain
The cleanest way to keep に straight is to contrast it with で, its most-confused neighbor. で marks a domain — an arena in which an action unfolds, or a means by which it is done. に marks a point — the single spot where something sits, arrives, or lands. A park is a domain if kids run around inside it (で); it is a point if a bench simply exists there (に).
図書館に本がある。
toshokan ni hon ga aru
There's a book in the library. (に — the point where it exists)
図書館で本を読む。
toshokan de hon o yomu
I read a book in the library. (で — the arena where the action happens)
Every use below is a variation on point. Whenever に and で both seem possible, ask: am I naming a fixed point, or a domain? The full comparison lives on に vs で.
1. Location of existence — 部屋に
With the existence verbs ある (inanimate) and いる (animate), and with stative location verbs like 住む (live) and 座る (sit), に marks the point where something exists.
部屋に猫がいる。
heya ni neko ga iru
There's a cat in the room.
駅の前にコンビニがあります。
eki no mae ni konbini ga arimasu
There's a convenience store in front of the station.
This is the anchor use — the point where a thing simply is. Full page: に: Location of Existence.
2. Specific time — 三時に
に marks a fixed point in time — a clock time, a date, a named occasion.
会議は三時に始まります。
kaigi wa san-ji ni hajimarimasu
The meeting starts at three.
月曜日にテストがあります。
getsuyōbi ni tesuto ga arimasu
There's a test on Monday.
The catch is that relative time words (今日, 明日, 毎日) take no に — they aren't fixed calendar points. That distinction gets worked out on に: Specific Points in Time.
3. Destination and goal — 東京に
With verbs of motion, に marks the endpoint — where the movement arrives.
来週、京都に行きます。
raishū, Kyōto ni ikimasu
I'm going to Kyoto next week.
七時に家に帰った。
shichi-ji ni ie ni kaetta
I got home at seven.
Notice that second sentence has two に doing two different jobs — a time point (七時に) and an arrival point (家に). Both are "points." Full page: に: Direction, Goal, and Recipient.
4. Recipient / indirect object — 友達に
The person who receives something — a letter, a phone call, a gift — is the endpoint of the transfer, so they take に.
母に電話した。
haha ni denwa shita
I called my mom.
友達にプレゼントをあげた。
tomodachi ni purezento o ageta
I gave my friend a present.
The recipient is just a destination for a thing rather than a place — the same "target endpoint" logic. This shares a page with destination: に: Direction, Goal, and Recipient.
5. Purpose of motion — 買いに
Attached to a verb stem before 行く / 来る / 帰る, に marks the goal you set out to accomplish.
昼ごはんを食べに行こう。
hirugohan o tabe ni ikō
Let's go (out) to eat lunch.
友達に会いに来た。
tomodachi ni ai ni kita
I came to see a friend.
The errand is the target of the going. Full page: に: Purpose with Motion Verbs.
6. Agent of a passive — 先生に
In a passive sentence, the person who does the action to you is marked with に — you are the endpoint on the receiving end.
先生に叱られた。
sensei ni shikarareta
I got scolded by the teacher.
弟に日記を読まれた。
otōto ni nikki o yomareta
My little brother read my diary (on me).
Here the English "by" maps onto に. See The Passive 受身: Formation.
7. Result of a change — 医者に
With なる (become) and a few change verbs, に marks the end state — what something turns into.
兄は医者になった。
ani wa isha ni natta
My older brother became a doctor.
信号が赤になった。
shingō ga aka ni natta
The light turned red.
A change has an endpoint too, and that endpoint takes に. See 〜になる: Become.
Putting it together
| Use | What に marks | Example |
|---|---|---|
| Existence | point in space | 部屋に猫がいる |
| Time | point in time | 三時に会う |
| Destination | endpoint of motion | 東京に行く |
| Recipient | endpoint of a transfer | 友達にあげる |
| Purpose | goal of going | 買いに行く |
| Passive agent | source acting on the endpoint (you) | 先生に叱られる |
| Result | endpoint of a change | 医者になる |
Common mistakes
❌ 部屋で猫がいる。
Incorrect — existence takes に, not で. で is for actions, not for where something simply is.
✅ 部屋に猫がいる。
heya ni neko ga iru
There's a cat in the room.
❌ 今日に会いましょう。
Incorrect — 今日 is a relative time word and takes no に.
✅ 今日会いましょう。
kyō aimashō
Let's meet today.
❌ 毎日に日本語を勉強する。
Incorrect — 毎日 ('every day') is relative and never takes に.
✅ 毎日日本語を勉強する。
mainichi nihongo o benkyō suru
I study Japanese every day.
❌ 図書館に勉強する。
Incorrect — studying is an action, so the place takes で, not に.
✅ 図書館で勉強する。
toshokan de benkyō suru
I study at the library.
The two errors English speakers make most both come from misreading point vs domain: using で where existence needs a point (に), and bolting に onto relative time words as if English "on today / on every day" were valid. Neither 今日 nor 毎日 is a fixed calendar point, so neither takes に.
Key takeaways
- に has many jobs, but they all mark a fixed point or target — in space, time, or an abstract endpoint.
- The master contrast is に (point) vs で (domain); when both seem possible, decide which one you mean.
- Existence, time, destination, recipient, purpose, passive agent, and result are the seven core uses — each with its own page.
- The classic English-speaker traps: で for existence and に on relative time words (×今日に, ×毎日に).
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- に: Location of Existence (ある・いる)N5 — に marks the point where something exists or is statically located, and pairs inseparably with ある/いる — the cleanest way to lock in the に-for-existence versus で-for-action split.
- に: Specific Points in TimeN5 — When time expressions take に and when they don't — the absolute-vs-relative divide that decides why 七時に and 月曜日に need に but 今日, 明日, and 毎日 never do.
- に: Direction, Goal, and RecipientN5 — に marks the endpoint of motion (東京に行く), the recipient of a transfer (母に手紙を書く), and the target of an action — three uses unified by one idea: に is where the action arrives.
- に vs で: Static vs Dynamic LocationN4 — The cornerstone location contrast — に marks where something exists or arrives (いる, 住む, 座る, 置く), で marks where an action happens (食べる, 働く, 勉強する) — decided by the verb, not the English preposition.