diff --git a/lib/server_settings/database_config.rb b/lib/server_settings/database_config.rb
index 0f3a284..e78ec2b 100644
--- a/lib/server_settings/database_config.rb
+++ b/lib/server_settings/database_config.rb
@@ -4,7 +4,11 @@ def self.slave_name(name, idx)
       name + "_slave#{idx}"
     end
 
-    def self.generate_database_config(db_role, with_slave:true)
+    def self.replica_name(name, suffix, idx)
+      "#{name}_#{suffix}#{idx}"
+    end
+
+    def self.generate_database_config(db_role, with_slave: true, replica_suffix: "replica")
       configuration = {}
       return configuration unless ServerSettings.databases
 
@@ -33,6 +37,12 @@ def self.generate_database_config(db_role, with_slave:true)
             config[:host] = db.backup if db_role == :backup
             stringify_keys!(config) if defined? Rails
             configuration[slave_name(db.name, idx)] = config
+
+            # AR6.1以降のDB分散機能の replica 向けの設定
+            config = config.dup
+            config[:replica] = true
+            stringify_keys!(config) if defined? Rails
+            configuration[replica_name(db.name, replica_suffix, idx)] = config
           end
         end
       end
diff --git a/spec/lib/server_settings/database_config_spec.rb b/spec/lib/server_settings/database_config_spec.rb
index 09ee809..6f7168f 100644
--- a/spec/lib/server_settings/database_config_spec.rb
+++ b/spec/lib/server_settings/database_config_spec.rb
@@ -29,7 +29,7 @@
     :backup: 'backup.com'
   no_backup:
     <<: *default
-EOF
+    EOF
   end
   before do
     filepath = "config.yml"
@@ -43,6 +43,11 @@
   describe ".slave_name" do
     it { expect(ServerSettings::DatabaseConfig.slave_name("hoge", 1)).to eq "hoge_slave1" }
   end
+
+  describe ".replica_name" do
+    it { expect(ServerSettings::DatabaseConfig.replica_name("hoge", "replica", 1)).to eq "hoge_replica1" }
+  end
+
   describe ".generate_database_config" do
     context "check configuration" do
       let(:database_config) { database_config = ServerSettings::DatabaseConfig.generate_database_config(:master) }
@@ -52,6 +57,11 @@
       context "when has slave" do
         it "contain slave key" do
           expect(database_config["has_slave_slave1"].class).to eq Hash
+          expect(database_config["has_slave_slave1"][:replica]).to be_nil
+        end
+        it "contain replica key" do
+          expect(database_config["has_slave_replica1"].class).to eq Hash
+          expect(database_config["has_slave_replica1"][:replica]).to be true
         end
       end
       context "when has group" do
@@ -63,6 +73,7 @@
         it "does not exist slave key" do
           no_slave_config = ServerSettings::DatabaseConfig.generate_database_config(:master, with_slave: false)
           expect(no_slave_config.has_key? "has_slave_slave1").to be false
+          expect(no_slave_config.has_key? "has_slave_replica1").to be false
         end
       end
       context "when use backup role" do