diff --git a/app/src/main/java/com/example/tampopo_client/models/FriendPair.java b/app/src/main/java/com/example/tampopo_client/models/FriendPair.java
new file mode 100644
index 0000000..4f9c35f
--- /dev/null
+++ b/app/src/main/java/com/example/tampopo_client/models/FriendPair.java
@@ -0,0 +1,36 @@
+package com.example.tampopo_client.models;
+
+public class FriendPair {
+    private Integer id;
+    private String user0Id;
+    private String user1Id;
+
+    public FriendPair(String user0Id, String user1Id) {
+        this.user0Id = user0Id;
+        this.user1Id = user1Id;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getUser0Id() {
+        return user0Id;
+    }
+
+    public void setUser0Id(String user0Id) {
+        this.user0Id = user0Id;
+    }
+
+    public String getUser1Id() {
+        return user1Id;
+    }
+
+    public void setUser1Id(String user1Id) {
+        this.user1Id = user1Id;
+    }
+}
diff --git a/app/src/main/java/com/example/tampopo_client/resources/FriendsResource.java b/app/src/main/java/com/example/tampopo_client/resources/FriendsResource.java
new file mode 100644
index 0000000..e7c57f9
--- /dev/null
+++ b/app/src/main/java/com/example/tampopo_client/resources/FriendsResource.java
@@ -0,0 +1,25 @@
+package com.example.tampopo_client.resources;
+
+import com.example.tampopo_client.models.FriendPair;
+
+public interface FriendsResource {
+    @FormUrlEncoded
+    @POST("friends")
+    Call<FriendPair> postFriends(
+            @Field("token") String token,
+            @Field("user0-id") String user0Id,
+            @Field("user1-id") String user1Id
+    );
+
+    @GET("friends/{pair_id}/")
+    Call<FriendPair> getFriend(
+            @Query("token") String token,
+            @Path("pair_id") String pairId
+    );
+
+    @DELETE("friends/{pair_id}/")
+    void deleteFriend(
+            @Query("token") String token,
+            @Path("pair_id") String pair_id
+    );
+}
diff --git a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendViewModel.java b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendViewModel.java
new file mode 100644
index 0000000..8b147a0
--- /dev/null
+++ b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendViewModel.java
@@ -0,0 +1,19 @@
+package com.example.tampopo_client.viewmodels;
+
+import androidx.lifecycle.ViewModel;
+
+import com.example.tampopo_client.resources.FriendsResource;
+
+public class FriendViewModel extends ViewModel {
+
+    private final Retrofit retrofit;
+    private final FriendsResource friendsResource;
+
+    public FriendViewModel(){
+        this.retrofit = new Retrofit.Builder()
+                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/tampopo-server/")
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build();
+        this.friendsResource = retrofit.create(FriendsResource.class);
+    }
+}