diff --git a/src/main/kotlin/org/library/book/domain/Book.kt b/src/main/kotlin/org/library/book/domain/Book.kt
new file mode 100644
index 0000000..a399557
--- /dev/null
+++ b/src/main/kotlin/org/library/book/domain/Book.kt
@@ -0,0 +1,37 @@
+package org.library.book.domain
+
+import jakarta.persistence.Column
+import jakarta.persistence.Entity
+import jakarta.persistence.Table
+import org.library.core.domain.BaseEntity
+
+@Entity
+@Table(name = "books")
+class Book(
+    title: String,
+    author: String,
+    isbn: String?,
+) : BaseEntity() {
+
+    @Column(nullable = false)
+    var title: String = title
+        protected set
+
+    @Column(nullable = false)
+    var author: String = author
+        protected set
+
+    @Column
+    var isbn: String? = normalizeIsbn(isbn)
+        protected set
+
+    init {
+        require(title.isNotBlank()) { "제목은 비어 있을 수 없습니다." }
+        require(author.isNotBlank()) { "저자는 비어 있을 수 없습니다." }
+    }
+
+    companion object {
+
+        fun normalizeIsbn(isbn: String?): String? = isbn?.trim()?.takeIf { it.isNotBlank() }
+    }
+}
diff --git a/src/main/kotlin/org/library/book/domain/BookRepository.kt b/src/main/kotlin/org/library/book/domain/BookRepository.kt
new file mode 100644
index 0000000..3cde0d7
--- /dev/null
+++ b/src/main/kotlin/org/library/book/domain/BookRepository.kt
@@ -0,0 +1,6 @@
+package org.library.book.domain
+
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface BookRepository : JpaRepository<Book, Long> {
+}