〜場合は (ばあいは): 'In the Case Of' / 'If' for Rules & Notices
The situations it was built for
場合 literally means "case" or "situation," and 〜場合は sets up a hypothetical condition: in the event that something happens, do this. It reaches for a specific situation that may arise — not a habit or a routine timing — and lays out what to do about it. Because 場合 is a noun carrying the weight of "case," the whole expression sounds formal and a little detached, which is why it lives on emergency notices, in contracts, and in how-to guides rather than in chatty conversation. The は can be dropped (〜場合), but it's common because it marks the situation as the topic.
地震の場合は、エレベーターを使わないでください。
じしんの ばあいは、エレベーターを つかわないで ください。
In case of an earthquake, please do not use the elevator.
遅れる場合は、連絡してください。
おくれる ばあいは、れんらくして ください。
If you are going to be late, please get in touch.
ヤッタンは、わからない場合は先生に聞きます。
ヤッタンは、わからない ばあいは せんせいに ききます。
When he doesn't understand, Yattan asks the teacher.
Plain negative + 場合 works the same way.
The の and な attachment trap
場合 attaches just like a noun-modifying clause: whatever describes 場合 sits right in front of it in plain form.
| Word type | Attachment | Example |
|---|---|---|
| Verb | plain form + 場合 | 行く場合 / 行かない場合 (if you go / if you don't go) |
| い-adjective | plain form + 場合 | 高い場合 (if it's expensive) |
| な-adjective | な + 場合 | 必要な場合 (if it's necessary) |
| Noun | の + 場合 | 雨の場合 (in case of rain) |
Two of these rows are where marks get lost. A noun takes の (火事の場合 = "in case of fire," never 火事場合), and a な-adjective keeps な (危険な場合 = "if it's dangerous," never 危険場合). The JLPT leans on exactly this because the other conditionals don't demand の/な the same way — miss the connector and the sentence is simply wrong.
Home turf: signs, manuals, and warnings
This is where you'll actually meet 場合. Public notices and instruction manuals lean on it constantly, precisely because it spells out "if X, then do Y" clearly and impersonally:
火事の場合は、すぐに外に出てください。
かじの ばあいは、すぐに そとに でて ください。
In case of fire, please go outside immediately.
故障した場合は、この番号に電話してください。
こしょうした ばあいは、この ばんごうに でんわして ください。
If it breaks down, please call this number.
Past plain した + 場合 = 'if/when it has happened.'
先生は、必要な場合は会議を開くと言いました。
せんせいは、ひつような ばあいは かいぎを ひらくと いいました。
The teacher said she would hold a meeting if it became necessary.
な-adjective: 必要 + な + 場合.
One case, not a running habit
場合 frames a single situation that could come up, then tells you the plan for it. Picturing one branch of possibility — "if this particular thing happens" — is the feel to hold on to:
雨の場合は、試合は中止です。
あめの ばあいは、しあいは ちゅうしです。
In case of rain, the match is cancelled.
One possible situation: 'if it rains.'
モチが来ない場合は、ヤッタンが代わりに行きます。
モチが こない ばあいは、ヤッタンが かわりに いきます。
If Mochi doesn't come, Yattan will go instead.
Choosing it over たら, なら, と, and 時
All four conditionals can translate as "if," but 場合 is the formal, written option. The everyday choices are 〜たら (most general "when/if"), 〜なら (responding to a topic: "if that's the case…"), and 〜と (automatic, natural results). In speech you'd almost always say 遅れたら連絡して ("text me if you're late"); the 場合 version, 遅れる場合は連絡して, belongs on a printed notice and sounds stiff to a friend. The rule of thumb: if it could be printed on a sign or appear in a manual, 場合 fits; otherwise reach for たら. For a deeper side-by-side, see the comparison of と・ば・たら・なら.
One more neighbour to keep separate is 時 (とき). 時 means "when" for things that simply happen; 場合 stresses a hypothetical or exceptional situation ("in the event that"). 困った場合 leans on "if you run into trouble," while 困った時 is closer to "when you had trouble." For routine timing, use 〜とき instead.
The short version
- 〜場合は = "in the case of / if," for a hypothetical situation that may come up.
- Attach to the plain form; noun + の + 場合, な-adjective + な + 場合.
- It's formal and written — rules, signs, manuals, warnings.
- In everyday speech, use たら / なら / と instead.
Practice it
Pick the correct attachment for 〜場合は (の / な / plain form).
＿＿＿に入れるのに最もよいものを選びなさい。
Choose the grammar pattern that best completes the sentence.
＿＿＿試合を中止します。
Frequently asked questions
What does 〜場合は mean?
It means 'in the case of' or 'if/when' a situation arises. It sets up a hypothetical condition and is most common in rules, instructions, and warnings: 地震の場合は、エレベーターを使わないでください ('in case of an earthquake, don't use the elevator').
How do I attach 場合 to different words?
Use the plain form: verbs and い-adjectives attach directly (行く場合, 高い場合), な-adjectives add な (必要な場合), and nouns add の (雨の場合).
What's the difference between 場合 and たら?
They overlap, but 場合 is formal and written — perfect for signs and manuals — while たら is the everyday spoken 'if/when.' Say 遅れたら連絡して to a friend, but write 遅れる場合は連絡してください on a notice.
Is 場合 the same as 時 (とき)?
Not quite. 時 means 'when' for things that happen normally, while 場合 highlights a hypothetical or exceptional situation ('in the event that'). 困った場合 leans on 'if you have trouble,' while 困った時 is more 'when you had trouble.'
Where 〜場合は fits
Shaky on this? Get these solid first
- Conditional 〜たら · N4 — 〜たら is Japanese's most flexible conditional: just add ら to the plain past. Learn the formation, the 'if/when' meaning, the discovery use, and how it beats ば/と for requests.
- は · N5 — は marks the topic of a sentence — 'as for X.' Learn how it flags known information, its contrast use, why it's read 'wa,' and how it differs from が.
Don't confuse it with
- Conditional 〜たら · N4 — 〜たら is Japanese's most flexible conditional: just add ら to the plain past. Learn the formation, the 'if/when' meaning, the discovery use, and how it beats ば/と for requests.
- Conditional 〜なら · N4 — 〜なら is the contextual 'if': it picks up a topic or premise — 日本に行くなら京都がいい. Learn the formation, how it differs from ば・たら・と, and why the main clause can come first.
- Conditional 〜と · N4 — The と conditional links A to an inevitable result B: 春になると、桜が咲く. Learn the plain-form formation, why B can't be a request, and how it differs from ば/たら/なら.
- 〜とき · N5 — とき(時) means 'when' in Japanese: attach plain form + とき. Learn noun+の, な-adj+な, plain verbs, and the key 行くとき vs 行ったとき tense difference.
More N4 grammar to explore
Keep going with related patterns at the same level:
- 〜がする — 〜がする marks a sense you perceive: においがする (there's a smell), 音がする (a sound), 味がする (a taste), 気がする (a feeling). Learn the nouns, the が particle, and the past がした.
- 〜じゃないか / 〜じゃない — 〜じゃないか / 〜じゃない seeks agreement or shows surprise — 'isn't it?', 'right?', 'see, I told you!'. Learn the tone that flips it from negation to confirmation, plus polite 〜じゃないですか.
- 〜かどうか — 〜かどうか packs a yes/no question inside a bigger sentence: 来るかどうか分からない ('I don't know whether he'll come'). Learn the formation, noun and な-adjective rules, and how it differs from question-word + か.
- かな・かしら・かい — かな means 'I wonder' (to yourself), かしら is its softer, traditionally feminine twin, and かい is a friendly casual yes/no question. Learn the nuances, register, and 〜ないかな ('I hope…').
- 〜方 — Add 方 (かた) to a verb's ます-stem to make a noun meaning 'how to do' or 'the way of doing': 作り方 (how to make), 使い方 (how to use), 読み方 (reading).
- 〜ことになる — 〜ことになる means a decision was made by circumstances or others: 転勤することになった. Learn the formation, the modest 'it turns out' nuance, and 〜ことになっている for rules.