ものとする means shall; to assume; understood as ~. It is a JLPT N1 Japanese grammar pattern used to indicate that something is to be interpreted, regarded, or treated in a particular way — often in formal writing like contracts, regulations, and official notices.
If you need to state an assumption, a legal stipulation, or the intended meaning behind a term, ものとする is exactly the tool you need. Because it appears frequently in N1 reading comprehension and real-world documents, mastering it will sharpen both your test performance and your ability to handle formal Japanese.
What does ものとする mean?
Use ものとする when you want to specify that a certain condition or understanding is to be taken as given. It imposes an interpretation or a requirement, often with the force of “it shall be deemed that” or “it is understood that.”
Natural translations include:
- shall; to assume; understood as ~
The best English equivalent depends on context. In a rulebook, “shall” works; in an explanatory note, “is assumed to be” feels more natural. Recognize the author’s intent — is it a command, a definition, or an assumption? — and choose accordingly.
How to form ものとする
The pattern attaches to a statement that expresses the content to be assumed or stipulated. The core formula is:
More concretely:
Examples of the attachment:
- 提出するものとする
- 有効であるものとする
- 異常がなければ正常であるものとする
In JLPT questions, pay attention to whether the stem word can attach directly or needs である — a common trap with な-adjectives and nouns.
When is ものとする used?
Use ものとする in situations like:
- laying out rules, terms of service, or contractual obligations
- defining how a word or situation should be interpreted
- writing official notices or procedural documents
Tone and register:
- highly formal; almost exclusively written
- typical in legal texts, manuals, test instructions, and N1 reading passages
Because of its stiff tone, avoid it in casual conversation. In spoken language, ことにする or plain とみなす are often more natural.
ものとする example sentences
After reading each sentence, notice that ものとする doesn’t just state a fact; it prescribes an interpretation. The meaning always points to how things should be understood going forward, not what simply is.
Nuance of ものとする
The core nuance is imposing an assumption or rule with the weight of authority. Unlike mere statements of fact, ものとする carries the force of “this is how we are going to treat the situation from now on.”
This matters because the distinction between “A was B” and “A shall be considered B” is huge in formal Japanese. For example:
- In manuals, it signals that the next step must follow only if the assumption holds.
- In contracts, it eliminates ambiguity by pinning down what each clause is supposed to mean legally.
A pullquote to remember:
ものとする vs こととする
Both ものとする and こととする can be translated as “shall,” but they operate in different semantic spaces.
The key difference: ものとする frames the result as an objective understanding that everyone is to follow, while こととする emphasizes the act of deciding or making it a rule. When a document says 〜ものとする, it is less about who decided and more about what the accepted meaning is.
Common mistakes with ものとする
A good practice is to ask: Am I telling people how things are, or am I telling them how things must be understood? If it’s the latter, ものとする fits. If it’s the former, pick a simpler pattern.
Is ものとする on the JLPT?
In N1 practice tests, questions often give you a sentence from a set of rules and ask whether a certain action violates the stated condition. Understanding ものとする as “shall be deemed” is critical for those logic-based items.
Practice questions for ものとする
Keep your first sentences concise and clearly anchored in a formal context. Once you’re comfortable, try blending ものとする with other N1 forms like ない限り or をもって to match real document complexity.
Learning path for ものとする
To learn ものとする efficiently, start with its formation, then compare it with similar patterns, and finally practice in context.
Related grammar to review next
- ものではない — because it also uses もの to express a principle or expectation, but in a prohibition or strong advice form
- ものを — because it shows counterfactual regret, contrasting with the declarative assumption of ものとする
- ものと思われる・ものと見られる — because they share the “〜ものと” structure and convey assumed conclusions from evidence
- ものとして — because it directly builds on the same base to express “acting on the assumption that” or “treating something as”
Reviewing these in a cluster will give you a solid intuitive feel for how formal assumptions and statements of general truth behave in Japanese.
Learn ものとする with Hane
If you want to review ものとする together with the related patterns above, Hane helps you practice Japanese in short, focused sessions.
Browse more lessons here:
FAQ about ものとする
What does ものとする mean in Japanese?
ものとする means “shall; to assume; understood as ~” in Japanese. It is an N1 grammar point, and this lesson explains its formation, nuance, example sentences, common mistakes, and similar grammar.
Is ものとする on the JLPT?
ものとする is taught as N1 Japanese grammar in Hane's grammar lesson archive. Review it with examples, usage notes, and related N1 patterns.
How should I practice ものとする?
Read several example sentences, identify the form before and after ものとする, then make your own short sentences and compare it with nearby grammar points.