noun
lodger; guest (esp. at a hotel)
Refers to a person staying overnight at a lodging facility, such as a hotel, inn, or guesthouse. More formal than 泊まる人.
このホテルの宿泊者は無料で朝食を食べられます。
Guests at this hotel can eat breakfast for free.
宿泊者名簿に名前を記入してください。
Please write your name in the guest register.
Compound of 宿泊 (lodging) + 者 (person).