Translation guide
In Japanese, the concept of a co-founder is expressed through specific terms that emphasize joint establishment. The most common and natural term is 共同創業者, but shorter alternatives exist depending on context. This guide covers the main options and their nuances.
Referring to a person who jointly establishes an organization, company, or movement.
The most direct and widely understood term for 'co-founder'. It explicitly means 'joint founder' and is suitable for formal and business contexts.
彼はその会社の共同創業者です。
He is a co-founder of that company.
Similar to 共同創業者, but 創設 emphasizes 'establishment' or 'founding' of an institution or organization. Often interchangeable, but slightly more formal.
彼女は大学の共同創設者として知られています。
She is known as a co-founder of the university.
Used when the focus is on the legal or formal establishment of an entity. Common for companies and organizations.
共同設立者として契約書に署名した。
As a co-founder, I signed the contract.
A direct loanword from English, used in startup and tech contexts. It sounds modern but may not be understood by all Japanese speakers.
彼はスタートアップのコーファウンダーだ。
He is a co-founder of a startup.
創業者 (sougyousha) is the most common term for 'founder' and is used for businesses. 創設者 (sousetsusha) is often used for institutions like universities or associations. 設立者 (setsuritsusha) emphasizes the legal act of establishment. Adding 共同 (kyoudou, 'joint') makes them 'co-founder' equivalents.