きっかけ

きっかけ is a noun meaning trigger, catalyst, opportunity, or starting point – the thing that sets an event or change in motion. It describes the initial cause or occasion that led to something happening, often something significant like a life change, a new habit, or a relationship beginning.

Common patterns

～がきっかけで – "triggered by ~" / "because of ~"

Used to state what served as the catalyst, followed by the result.

～をきっかけに（して） – "taking ~ as an opportunity" / "since ~"

Emphasizes using an event as a springboard for action or change.

～がきっかけだった – "~ was the trigger"

Used to explain in retrospect what started something.

～（した）ことがきっかけで – "the fact that ~ was the trigger"

A common way to turn a verb clause into the trigger.

Nuance

きっかけ focuses on the initial spark rather than the ongoing cause. It often carries a positive or neutral connotation – the sense that something opened a door. Compare this with げんいん原因 (げんいん), which is more neutral/negative and means "cause" in a more analytical sense, and りゆう理由 (りゆう), which means "reason" and can be used more broadly.

きっかけ is used when talking about personal experiences: how you started a hobby, met someone important, changed careers, etc.