connective N1 uncommon politewritten
一つには — for one thing / one reason being ~
一つには ・ ひとつには
Builds on 一つ
Meaning
- for one thing / one reason being ~ — flags one of several reasons, with others implied or to follow
Key sentence
彼が成功したのは、一つには運がよかったからだ。
One reason he succeeded is that he was lucky.
Formation
| Attaches to | Form | Example |
|---|---|---|
| Adverb / sentence-initial connective | 一つには + clause（often closing in 〜から／〜ため） | 一つには〜、二つには〜 |
When: Sets up an explicit enumeration of reasons; often answered by 二つには 'for another' or もう一つは.
Examples
都会を離れたのは、一つには家賃が高すぎたからだ。
One reason I left the city is that the rent was too high.
計画が遅れたのは、一つには予算不足、もう一つは人手不足による。
The plan fell behind partly due to a lack of budget, and partly due to a shortage of staff.
Easily confused with
第一 一つには presents one reason among several, neutral in ranking; 第一 foregrounds the first/most important point and can stand alone as 'above all'. 一つ 一つには is the crystallized connective for enumerating reasons; bare 一つ also carries a softening request/volitional sense ('kindly / let me just') that 一つには does not.
See 一つには in real sentences
Jengo shows 一つには the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled with reference to A Dictionary of Advanced Japanese Grammar.