diff --git a/app/src/main/java/com/example/nemophila/viewmodels/PostsViewModel.java b/app/src/main/java/com/example/nemophila/viewmodels/PostsViewModel.java
new file mode 100644
index 0000000..aa5929d
--- /dev/null
+++ b/app/src/main/java/com/example/nemophila/viewmodels/PostsViewModel.java
@@ -0,0 +1,87 @@
+package com.example.nemophila.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.nemophila.entities.Post;
+import com.example.nemophila.resources.PostsRest;
+
+import java.util.Collection;
+
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+import retrofit2.Retrofit;
+import retrofit2.converter.jackson.JacksonConverterFactory;
+
+public class PostsViewModel extends ViewModel {
+
+    //Field
+    final private Retrofit retrofit;
+    final private PostsRest postsRest;
+    private String pid;
+
+    //LiveData
+    final private MutableLiveData<Collection<Post>> postsLiveData;
+
+    //コンストラクタ
+    public PostsViewModel() {
+        this.postsLiveData = new MutableLiveData<>();
+        this.retrofit = new Retrofit.Builder()
+                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/Nemophila/")
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build();
+        this.postsRest = retrofit.create(PostsRest.class);
+        this.pid = null;
+    }
+
+    //getter
+    public LiveData<Collection<Post>> getLiveData() {
+        return this.postsLiveData;
+    }
+
+    //API通信メソッド
+    public void fetchPosts(String uid) {
+        Call<Collection<Post>> call = postsRest.getAccountPosts(uid);
+        call.enqueue(new Callback<Collection<Post>>() {
+            @Override
+            public void onResponse(Call<Collection<Post>> call, Response<Collection<Post>> response) {
+                if (response.isSuccessful()) {
+                    postsLiveData.setValue(response.body());
+                } else {
+                    //レスポンスエラーを通知
+                }
+            }
+
+            @Override
+            public void onFailure(Call<Collection<Post>> call, Throwable t) {
+                //通信エラーを通知
+            }
+        });
+    }
+
+    public String createPost(String uid, String token, String sid,
+                           String rate, String genre, String comment,
+                           String image1, String image2, String image3) {
+
+        Call<String> call = postsRest.postAccountPost(uid ,token, sid, rate, genre, comment, image1, image2, image3);
+
+        call.enqueue(new Callback<String>() {
+            @Override
+            public void onResponse(Call<String> call, Response<String> response) {
+                if (response.isSuccessful()) {
+                    pid = response.body();
+                } else {
+                    //レスポンスエラーを通知
+                }
+            }
+
+            @Override
+            public void onFailure(Call<String> call, Throwable t) {
+                //通信エラーを通知
+            }
+        });
+        return pid;
+    }
+}