〜ひとり〜のみならず

Meaning

「ひとり」 is written 「独り」, meaning "that alone." It means "not only ~," emphasizing that the scope is not confined to one thing but extends more broadly. A stiff, written-style expression.

Examples

これはひとり日本のみならず、世界全体の課題である。 This is not just Japan's issue alone, but a challenge for the entire world.
環境問題は独り政府のみならず、市民一人ひとりの責任だ。 Environmental issues are not solely the government's responsibility, but that of every citizen.