1To be needed; to be necessary; to require. A godan verb (negative 要らない, polite 要ります) — note this is a different word from the ichidan existence verb 居る/いる, despite sharing the reading. Often written in kana, but the kanji 要る is also common in writing.
海外旅行にはパスポートがいる。
You need a passport for overseas travel.
このアプリを使うのに登録はいりますか？
Do I need to register to use this app?
心配はいらないよ、ちゃんとやるから。
You don't need to worry — I'll handle it properly.
引っ越しには思った以上にお金がいる。
Moving costs more money than I expected.
袋はいりますか？
Do you need a bag?