を契機(けいき)に

Lead to, As a good opportunity to, As a result of, As a trigger

Structure

Noun + を契機(けいき) + に⁽¹⁾
Verb + の⁽²⁾ + を契機(けいき) + に⁽¹⁾

⁽¹⁾ にして、として
⁽²⁾ こと

Details

Register
Formal
使用域
硬い

About を契機に

を契機(けいき)に is a grammar construction made up of を, the noun 契機(けいき) 'chance' or 'trigger' and に. It is a formal pattern that is used to indicate some sort of trigger and may be translated '(A) led to (B)', 'as an opportunity to (A), (B)', or 'as a result of (A), (B)'. (A) may either be a positive or negative event, but will usually be something extremely big in terms of life, or current/historical events in the world.
を契機(けいき)に will be seen after nouns, or verbs that have been nominalized with either の or こと.

子供(こども)が生(う)まれたのを契機(けいき)に、パチンコをやめることに決(き)めた。
I decided to quit pachinko as a result of my child being born.
移動(いどう)制限(せいげん)が緩和(かんわ)されたことを契機(けいき)に、観光客(かんこうきゃく)の数(かず)が増(ふ)えた。
The travel restriction being eased led to an increase of tourists.
彼女(かのじょ)は出産(しゅっさん)を契機(けいき)に、会社(かいしゃ)を辞(や)めた。
She quit her job as a result of giving birth.

Alternatively, にして or として may replace に without any change in the overall meaning.

田中(たなか)さんは入院(にゅういん)を契機(けいき)にして、タバコを止(や)めました。
Tanaka-san being hospitalized led him to quit smoking.
大統領(だいとうりょう)の暗殺(あんさつ)を契機(けいき)として、戦争(せんそう)が始(はじ)まった。
The assassination of the president led to a war.

Caution - Unlike をきっかけに, を契機(けいき)に will almost exclusively be used in relation to some turning point or critical juncture. Due to this, it can sound quite unnatural when used to express a trigger that would not be considered a big event.

先輩(せんぱい)が楽(たの)しそうに料理(りょうり)をしている姿(すがた)を見(み)たのをきっかけに、私(わたし)も料理(りょうり)を始(はじ)めることにした。
Seeing my senpai enjoy cooking led me to start cooking too. (Natural Japanese)
先輩(せんぱい)が楽(たの)しそうに料理(りょうり)をしている姿(すがた)を見(み)たのを契機(けいき)に、私(わたし)も料理(りょうり)を始(はじ)めることにした。
Seeing my senpai enjoy cooking led me to start cooking too. (Unnatural Japanese)

Synonyms

Examples

鎖国(さこく)とは、日本(にほん)では海外(かいがい)との交流(こうりゅう)を遮断(しゃだん)する政策(せいさく)であった。黒船(くろふね)の到着(とうちゃく)を契機(けいき)に鎖国(さこく)が終(お)わった。
'Sakoku' was the Japanese policy of cutting off any cultural exchange with foreign countries. The arrival of the black ships led to the end of 'Sakoku'.
スプートニクは１９５７年(ねん)に打(う)ち上(あ)げられた。それを契機(けいき)に宇宙(うちゅう)開発(かいはつ)の時代(じだい)が始(はじ)まった。
Sputnik was launched in 1957. As a result of the launch, the space race began.
初(はじ)めてのトランジスタが考案(こうあん)されたのを契機(けいき)に新(あたら)しい技術(ぎじゅつ)革新(かくしん)が持(も)ち上(あ)がった。
A new innovation in technology suddenly happened with the transistor being developed for the first time as a trigger.
転職(てんしょく)を契機(けいき)に落(お)ち着(つ)きを取(と)り戻(もど)した。
As a result of my change in occupation, I was able to regain my composure.
あんなに大人(おとな)しかった彼(かれ)が、引越(ひっこ)しを契機(けいき)によく話(はな)すようになった。
He, who was so quiet, has, as a result of moving, become quite talkative.
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を契機に – Grammar Discussion

Most Recent Replies (3 in total)

Hadros232232
About 3 years ago
What is the difference between を契機に and をきっかけ?
wrt7MameLZE33wlmpCAV
About 1 year ago
The details for this grammar point indicate it can be written ～にして・として, but none of the examples show this usage and both are simply marked wrong. Under what circumstances are these variations used?
Fuga
About 1 year ago
Hey @Hadros232232 !

を契機に is usually used in writing, or when the speaker is talking about social issues or historical topics, but きっかけに is usually used when talking about yourself.