一つには

Japanese Grammar Advanced Japanese ★★★ 3/5 formal ひとつにはhitotsu niwa
Reading ひとつには
Romaji hitotsu niwa
Formation 一つには + Reason Clause(、もう一つには + Reason Clause)
Kanji breakdown 一 (one) + つ (counter) + に (to) + は (topic)

Meaning

An adverbial phrase meaning 'partly' or 'for one thing,' used when the speaker presents one of multiple reasons or factors contributing to a situation. It signals that the explanation being offered is not exhaustive.

一つには is used to introduce one reason among several, often followed by a second reason introduced by もう一つには or また. It implies the speaker acknowledges multiple contributing factors and is highlighting just one. The phrase carries a measured, analytical tone and is frequently found in expository writing, academic discussion, and formal speech. Unlike 一方で, which presents contrasting situations, 一つには specifically enumerates reasons or causes. It differs from まず in that まず simply orders points sequentially, whereas 一つには explicitly signals partiality of explanation.

Examples

  1. 出生率が低下した原因は、一つには経済的な不安定さにある。 The cause of the declining birth rate is partly due to economic instability.
  2. 彼が転職を決意した理由は、一つには職場の人間関係の悪化であった。 One reason he decided to change jobs was the deterioration of workplace relationships.
  3. 地方の過疎化が進む背景には、一つには若者の都市部への流出がある。 Behind the depopulation of rural areas, one factor is the outflow of young people to urban areas.

Usage Guide

Context: written, academic, spoken

Tone: analytical

Do Say

  • 研究が遅延した要因は、一つには予算の削減にある。
  • 一つには文化的な背景の違いが、相互理解を妨げている。
  • 離職率が高い理由は、一つには長時間労働の常態化であろう。

Don't Say

  • 一つには今日は天気がいい。 (Using 一つには to state a standalone fact rather than to enumerate reasons — 一つには must introduce one of multiple causes or factors) → 今日は天気がいい。
  • 一つには彼が遅刻した。 (Using 一つには to describe a single event without explaining causation — the phrase requires a multi-reason analytical context) → 彼が遅刻した理由は、一つには電車の遅延にある。

Origin & History

一つには is composed of 一つ (one thing) and the particle には (as for). The phrase literally means 'as for one thing' and has been used in formal Japanese prose since the early modern period to structure multi-causal arguments.

Cultural Context

Generation: All ages

Social background: Universal

Related Phrases

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