diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/db/BaseRealmHelper.kt b/app/src/main/kotlin/jackall/overlaymulticounter/db/BaseRealmHelper.kt
new file mode 100644
index 0000000..af0f1f0
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/db/BaseRealmHelper.kt
@@ -0,0 +1,18 @@
+package jackall.overlaymulticounter.db
+
+import io.realm.Realm
+import io.realm.RealmModel
+import io.realm.RealmResults
+
+/**
+ * Created by matsumoto_k on 2017/11/08.
+ */
+abstract class BaseRealmHelper<T : RealmModel> {
+    protected val realm by lazy { Realm.getDefaultInstance() }
+    abstract fun insert(realmObject: T)
+    abstract fun update(realmObject: T)
+    abstract fun findAll(): RealmResults<T>
+    fun close() {
+        realm.close()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/db/CounterRealmHelper.kt b/app/src/main/kotlin/jackall/overlaymulticounter/db/CounterRealmHelper.kt
new file mode 100644
index 0000000..06d5ccf
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/db/CounterRealmHelper.kt
@@ -0,0 +1,38 @@
+package jackall.overlaymulticounter.db
+
+import io.realm.RealmResults
+import jackall.overlaymulticounter.vo.Counter
+
+/**
+ * Created by matsumoto_k on 2017/11/08.
+ */
+class CounterRealmHelper : BaseRealmHelper<Counter>() {
+    val query by lazy { realm.where(Counter::class.java) }
+    override fun insert(realmObject: Counter) {
+        realm.executeTransaction {
+            realm.copyToRealm(realmObject)
+        }
+    }
+
+    override fun update(realmObject: Counter) {
+        realm.executeTransaction {
+            realm.copyToRealmOrUpdate(realmObject)
+        }
+    }
+
+    fun plus(id: Int) {
+        query.equalTo("id", id).findFirst().apply {
+            count++
+        }
+    }
+
+    fun minus(id: Int) {
+        query.equalTo("id", id).findFirst().apply {
+            count--
+        }
+    }
+
+    override fun findAll(): RealmResults<Counter> {
+        return query.findAll()
+    }
+}
\ No newline at end of file