diff --git a/src/main/java/video/domain/price/ChildrenPrice.java b/src/main/java/video/domain/price/ChildrenPrice.java
new file mode 100644
index 0000000..7301e5f
--- /dev/null
+++ b/src/main/java/video/domain/price/ChildrenPrice.java
@@ -0,0 +1,8 @@
+package video.domain.price;
+
+public class ChildrenPrice implements Price {
+    public int amount(int daysRented) {
+        if (daysRented <= 3) return 150;
+        return 150 + (daysRented - 3) * 150;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/video/domain/price/NewReleasePrice.java b/src/main/java/video/domain/price/NewReleasePrice.java
new file mode 100644
index 0000000..2631a55
--- /dev/null
+++ b/src/main/java/video/domain/price/NewReleasePrice.java
@@ -0,0 +1,8 @@
+package video.domain.price;
+
+public class NewReleasePrice implements Price {
+
+    public int amount(int daysRented) {
+        return daysRented * 300;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/video/domain/price/Price.java b/src/main/java/video/domain/price/Price.java
new file mode 100644
index 0000000..c4a372a
--- /dev/null
+++ b/src/main/java/video/domain/price/Price.java
@@ -0,0 +1,5 @@
+package video.domain.price;
+
+public interface Price {
+    int amount(int daysRented);
+}
diff --git a/src/main/java/video/domain/price/RegularPrice.java b/src/main/java/video/domain/price/RegularPrice.java
new file mode 100644
index 0000000..cc8b589
--- /dev/null
+++ b/src/main/java/video/domain/price/RegularPrice.java
@@ -0,0 +1,8 @@
+package video.domain.price;
+
+public class RegularPrice implements Price {
+    public int amount(int daysRented) {
+        if (daysRented <= 2) return 200;
+        return 200 + (daysRented - 2) * 150;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/video/domain/rental/ChildrenPrice.java b/src/main/java/video/domain/rental/ChildrenPrice.java
deleted file mode 100644
index 8c8c32a..0000000
--- a/src/main/java/video/domain/rental/ChildrenPrice.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package video.domain.rental;
-
-public class ChildrenPrice {
-    public ChildrenPrice() {
-    }
-
-    int price(int daysRented) {
-        if (daysRented <= 3) return 150;
-        return 150 + (daysRented - 3) * 150;
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/video/domain/rental/NewReleasePrice.java b/src/main/java/video/domain/rental/NewReleasePrice.java
deleted file mode 100644
index 0bc61e3..0000000
--- a/src/main/java/video/domain/rental/NewReleasePrice.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package video.domain.rental;
-
-public class NewReleasePrice {
-    public NewReleasePrice() {
-    }
-
-    int price(int daysRented) {
-        return daysRented * 300;
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/video/domain/rental/RegularPrice.java b/src/main/java/video/domain/rental/RegularPrice.java
deleted file mode 100644
index dcb05d0..0000000
--- a/src/main/java/video/domain/rental/RegularPrice.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package video.domain.rental;
-
-public class RegularPrice {
-    public RegularPrice() {
-    }
-
-    int price(int daysRented) {
-        if (daysRented <= 2) return 200;
-        return 200 + (daysRented - 2) * 150;
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/video/domain/rental/Rental.java b/src/main/java/video/domain/rental/Rental.java
index 55bf1c6..72c1e53 100644
--- a/src/main/java/video/domain/rental/Rental.java
+++ b/src/main/java/video/domain/rental/Rental.java
@@ -2,6 +2,9 @@
 
 import video.domain.Movie;
 import video.domain.PriceType;
+import video.domain.price.ChildrenPrice;
+import video.domain.price.NewReleasePrice;
+import video.domain.price.RegularPrice;
 
 public class Rental {
     private final RegularPrice regularPrice = new RegularPrice();
@@ -28,11 +31,11 @@ public int amount() {
         int daysRented = getDaysRented();
         switch (getMovie().getPriceType()) {
             case REGULAR:
-                return regularPrice.price(daysRented);
+                return regularPrice.amount(daysRented);
             case NEW_RELEASE:
-                return newReleasePrice.price(daysRented);
+                return newReleasePrice.amount(daysRented);
             case CHILDREN:
-                return childrenPrice.price(daysRented);
+                return childrenPrice.amount(daysRented);
             default:
                 throw new RuntimeException("ビデオの区分が誤っています");
         }