問題なのは

the problem is

→ 問題

phrase Rare #33,410

the problem is Used to focus on and introduce the thing that is problematic or important. It is often followed by ではなくて (rather than), かどうか (whether), or こと (the fact that).

JA: 問題なのは、彼が約束を守らないことだ。

EN: The problem is that he doesn't keep his promises.

問題なのは何を読むかではなくてどう読むかである。

The issue is not what you read, but how you read it.

問題なのは私たちに十分な時間がないことだ。

The problem is that we don't have enough time.

問題なのは、彼女の能力ではなくて性格だ。

The problem isn't her ability; it's her personality.

問題なのは彼が時間通りに来るかどうかだ。

The question is whether he’ll arrive on time.

私にとって結局問題なのは商売が好きかどうかということだ。

Ultimately, the question for me is whether I like doing business or not.