diff --git a/src/main/java/video/domain/Customer.java b/src/main/java/video/domain/Customer.java
index 3bb6a68..f0e7881 100644
--- a/src/main/java/video/domain/Customer.java
+++ b/src/main/java/video/domain/Customer.java
@@ -1,11 +1,11 @@
 package video.domain;
 
-import java.util.ArrayList;
-import java.util.List;
+import video.domain.rental.Rental;
+import video.domain.rental.Rentals;
 
 public class Customer {
     private String name;
-    private List<Rental> rentals = new ArrayList<>();
+    private Rentals rentals = new Rentals();
 
     public Customer(String name) {
         this.name = name;
@@ -19,14 +19,14 @@ public String getName() {
         return name;
     }
 
-    public List<Rental> getRentals() {
+    public Rentals getRentals() {
         return rentals;
     }
 
     public RentalResult rentalMovies() {
         int totalAmount = 0;
         int frequentRenterPoints = 0;
-        for (Rental each : rentals) {
+        for (Rental each : rentals.list()) {
             int thisAmount = each.amount();
             frequentRenterPoints += each.frequentRenterPoints();
             totalAmount += thisAmount;
diff --git a/src/main/java/video/domain/Rental.java b/src/main/java/video/domain/rental/Rental.java
similarity index 88%
rename from src/main/java/video/domain/Rental.java
rename to src/main/java/video/domain/rental/Rental.java
index 0652924..6c6f094 100644
--- a/src/main/java/video/domain/Rental.java
+++ b/src/main/java/video/domain/rental/Rental.java
@@ -1,4 +1,7 @@
-package video.domain;
+package video.domain.rental;
+
+import video.domain.Movie;
+import video.domain.PriceType;
 
 public class Rental {
     private Movie movie;
@@ -17,7 +20,7 @@ public Movie getMovie() {
         return movie;
     }
 
-    int amount() {
+    public int amount() {
         int thisAmount = 0;
         // 金額を計算
         switch (getMovie().getPriceType()) {
@@ -38,7 +41,7 @@ int amount() {
         return thisAmount;
     }
 
-    int frequentRenterPoints() {
+    public int frequentRenterPoints() {
         // 新作を二日以上借りた場合はボーナスポイント
         if ((getMovie().getPriceType() == PriceType.NEW_RELEASE) &&
             getDaysRented() > 1) return 2;
diff --git a/src/main/java/video/domain/rental/Rentals.java b/src/main/java/video/domain/rental/Rentals.java
new file mode 100644
index 0000000..3e6aca3
--- /dev/null
+++ b/src/main/java/video/domain/rental/Rentals.java
@@ -0,0 +1,16 @@
+package video.domain.rental;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Rentals {
+    List<Rental> list = new ArrayList<>();
+
+    public void add(Rental rental) {
+        list.add(rental);
+    }
+
+    public List<Rental> list() {
+        return list;
+    }
+}
diff --git a/src/main/java/video/infrastructure/datasource/RentalDataSource.java b/src/main/java/video/infrastructure/datasource/RentalDataSource.java
index cafd262..870276f 100644
--- a/src/main/java/video/infrastructure/datasource/RentalDataSource.java
+++ b/src/main/java/video/infrastructure/datasource/RentalDataSource.java
@@ -1,6 +1,7 @@
 package video.infrastructure.datasource;
 
-import video.domain.Rental;
+import video.domain.rental.Rental;
+import video.domain.rental.Rentals;
 import video.infrastructure.datasource.data.RentalItem;
 import video.infrastructure.datasource.data.RentalRecord;
 import video.infrastructure.datasource.data.RentalSummary;
@@ -22,12 +23,12 @@ public class RentalDataSource {
     /**
      * レンタルの記録
      */
-    public int registerRental(String customerName, List<Rental> rentals, int totalAmount) {
+    public int registerRental(String customerName, Rentals rentals, int totalAmount) {
 
         int rentalId = rentalNumber.incrementAndGet();
         rentalRecords.put(rentalId, new RentalRecord(customerName, totalAmount));
         ArrayList<RentalItem> items = new ArrayList<>();
-        for (Rental rental : rentals) {
+        for (Rental rental : rentals.list()) {
             items.add(new RentalItem(rental.getMovie(), rental.getDaysRented()));
         }
         rentalItems.put(rentalId, items);
diff --git a/src/main/java/video/infrastructure/transfer/RentalNotificationTransfer.java b/src/main/java/video/infrastructure/transfer/RentalNotificationTransfer.java
index fbdba73..524471a 100644
--- a/src/main/java/video/infrastructure/transfer/RentalNotificationTransfer.java
+++ b/src/main/java/video/infrastructure/transfer/RentalNotificationTransfer.java
@@ -2,16 +2,15 @@
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import video.domain.Rental;
-
-import java.util.List;
+import video.domain.rental.Rental;
+import video.domain.rental.Rentals;
 
 public class RentalNotificationTransfer {
 
     private static final Logger logger = LoggerFactory.getLogger(RentalNotificationTransfer.class);
-    public void notice(String customerName, List<Rental> rentals) {
+    public void notice(String customerName, Rentals rentals) {
         StringBuilder result = new StringBuilder();
-        for (Rental rental : rentals) {
+        for (Rental rental : rentals.list()) {
             result.append("Movie: " + rental.getMovie().getTitle() + " Days Rented: " + rental.getDaysRented() + " ");
         }
         logger.info(customerName + ": " + result);
diff --git a/src/test/java/video/domain/CustomerTest.java b/src/test/java/video/domain/CustomerTest.java
index 5bad885..899fff4 100644
--- a/src/test/java/video/domain/CustomerTest.java
+++ b/src/test/java/video/domain/CustomerTest.java
@@ -1,6 +1,7 @@
 package video.domain;
 
 import org.junit.jupiter.api.Test;
+import video.domain.rental.Rental;
 
 import static org.junit.jupiter.api.Assertions.assertAll;
 import static org.junit.jupiter.api.Assertions.assertEquals;
diff --git a/src/test/java/video/domain/RentalTest.java b/src/test/java/video/domain/RentalTest.java
index e0465c0..968916e 100644
--- a/src/test/java/video/domain/RentalTest.java
+++ b/src/test/java/video/domain/RentalTest.java
@@ -2,6 +2,7 @@
 
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
+import video.domain.rental.Rental;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;