Translation guide
The English phrase "inner part" refers to the inside or interior of something. In Japanese, this concept is expressed through several words and patterns depending on what kind of "inside" is meant—physical interior, abstract inner self, or the deeper part of a space or object.
Referring to the inside of a physical thing, such as a room, container, or body part.
General term for the inside or interior of something, often used for machines, buildings, or organizations.
建物の内部はとても広い。
The inner part of the building is very spacious.
機械の内部を掃除する。
Clean the inner part of the machine.
Emphasizes the inner side or surface, often contrasted with the outside. Common for clothing, containers, and physical layers.
箱の内側に名前を書いてください。
Please write your name on the inner part of the box.
コートの内側は暖かい素材でできている。
The inner part of the coat is made of warm material.
Everyday word for 'inside'. Very common but can be vague; often used with location particles.
箱の中に何が入っていますか。
What is in the inner part of the box?
Referring to the inside of a living body, such as organs or deep tissues.
Used for internal body parts in medical or formal contexts.
耳の内部に炎症があります。
There is inflammation in the inner part of the ear.
Refers to the deep or innermost part, often used for body cavities or recesses.
喉の奥が痛い。
The inner part of my throat hurts.
Referring to one's inner thoughts, feelings, or true nature.
Refers to one's inner self, personality, or psychological interior.
彼は外見は優しそうだが、内面は強い。
He looks gentle on the outside, but his inner part is strong.
Literally 'the depths of the heart', used for deep-seated feelings or true intentions.
心の奥では彼を信じていた。
In the inner part of my heart, I believed in him.
Referring to the innermost area of a room, forest, or other space, often far from the entrance.
Indicates the back or far inner part of a space. Very common for rooms, buildings, and natural areas.
店の奥に座りましょう。
Let's sit in the inner part of the shop.
森の奥には湖がある。
There is a lake in the inner part of the forest.
Literally 'deepest part', used for caves, oceans, or metaphorical depths. Technical or literary.
内部 (ないぶ) is formal and often used for mechanical, structural, or organizational interiors. 内側 (うちがわ) focuses on the inner side or surface, often in contrast with the outside. 中 (なか) is the most general and colloquial, but can be too vague for precise descriptions.
English often uses 'inner part' as a phrase, but Japanese rarely uses a direct equivalent like 内側の部分. Instead, choose the specific noun that fits the context.
洞窟の最深部には誰も行ったことがない。
No one has ever gone to the innermost part of the cave.