also: せいこうのカギ
key to success; key success factor
A set phrase meaning the crucial element or factor that leads to success.
Effort is the key to success.
The key to this project's success is teamwork.
Standard kanji spelling.
Katakana spelling for emphasis or stylistic effect.
Compound of 成功 (success) + の (possessive particle) + 鍵 (key). A straightforward metaphorical phrase.