diff --git a/pkg/app/piped/executor/ecs/deploy.go b/pkg/app/piped/executor/ecs/deploy.go
index ca40ecabdc..14f8c517bc 100644
--- a/pkg/app/piped/executor/ecs/deploy.go
+++ b/pkg/app/piped/executor/ecs/deploy.go
@@ -17,6 +17,8 @@ package ecs
 import (
 	"context"
 
+	"github.com/aws/aws-sdk-go-v2/service/ecs/types"
+
 	"github.com/pipe-cd/pipecd/pkg/app/piped/deploysource"
 	"github.com/pipe-cd/pipecd/pkg/app/piped/executor"
 	"github.com/pipe-cd/pipecd/pkg/config"
@@ -97,9 +99,13 @@ func (e *deployExecutor) ensureSync(ctx context.Context) model.StageStatus {
 		return model.StageStatus_STAGE_FAILURE
 	}
 
-	primary, _, ok := loadTargetGroups(&e.Input, e.appCfg, e.deploySource)
-	if !ok {
-		return model.StageStatus_STAGE_FAILURE
+	var primary *types.LoadBalancer
+	// When the service is not accessed via ELB, the target group is not used.
+	if ecsInput.IsAccessedViaELB() {
+		primary, _, ok = loadTargetGroups(&e.Input, e.appCfg, e.deploySource)
+		if !ok {
+			return model.StageStatus_STAGE_FAILURE
+		}
 	}
 
 	recreate := e.appCfg.QuickSync.Recreate
diff --git a/pkg/config/application_ecs.go b/pkg/config/application_ecs.go
index fb0e5e72d3..14deab78c6 100644
--- a/pkg/config/application_ecs.go
+++ b/pkg/config/application_ecs.go
@@ -16,6 +16,12 @@ package config
 
 import (
 	"encoding/json"
+	"fmt"
+)
+
+const (
+	AccessTypeELB              string = "ELB"
+	AccessTypeServiceDiscovery string = "SERVICE_DISCOVERY"
 )
 
 // ECSApplicationSpec represents an application configuration for ECS application.
@@ -32,6 +38,11 @@ func (s *ECSApplicationSpec) Validate() error {
 	if err := s.GenericApplicationSpec.Validate(); err != nil {
 		return err
 	}
+
+	if err := s.Input.validate(); err != nil {
+		return err
+	}
+
 	return nil
 }
 
@@ -57,12 +68,22 @@ type ECSDeploymentInput struct {
 	// Run standalone task during deployment.
 	// Default is true.
 	RunStandaloneTask *bool `json:"runStandaloneTask" default:"true"`
+	// How the ECS service is accessed.
+	// Possible values are:
+	//  - ELB -  The service is accessed via ELB and target groups.
+	//  - SERVICE_DISCOVERY -  The service is accessed via ECS Service Discovery.
+	// Default is ELB.
+	AccessType string `json:"accessType" default:"ELB"`
 }
 
 func (in *ECSDeploymentInput) IsStandaloneTask() bool {
 	return in.ServiceDefinitionFile == ""
 }
 
+func (in *ECSDeploymentInput) IsAccessedViaELB() bool {
+	return in.AccessType == AccessTypeELB
+}
+
 type ECSVpcConfiguration struct {
 	Subnets        []string
 	AssignPublicIP string
@@ -121,3 +142,13 @@ func (opts ECSTrafficRoutingStageOptions) Percentage() (primary, canary int) {
 	canary = 0
 	return
 }
+
+func (in *ECSDeploymentInput) validate() error {
+	switch in.AccessType {
+	case AccessTypeELB, AccessTypeServiceDiscovery:
+		break
+	default:
+		return fmt.Errorf("invalid accessType: %s", in.AccessType)
+	}
+	return nil
+}
diff --git a/pkg/config/application_ecs_test.go b/pkg/config/application_ecs_test.go
index 2b63f733e1..305a4bf437 100644
--- a/pkg/config/application_ecs_test.go
+++ b/pkg/config/application_ecs_test.go
@@ -16,6 +16,7 @@ package config
 
 import (
 	"encoding/json"
+	"fmt"
 	"testing"
 	"time"
 
@@ -64,10 +65,79 @@ func TestECSApplicationConfig(t *testing.T) {
 					LaunchType:        "FARGATE",
 					AutoRollback:      newBoolPointer(true),
 					RunStandaloneTask: newBoolPointer(true),
+					AccessType:        "ELB",
 				},
 			},
 			expectedError: nil,
 		},
+		{
+			fileName:           "testdata/application/ecs-app-service-discovery.yaml",
+			expectedKind:       KindECSApp,
+			expectedAPIVersion: "pipecd.dev/v1beta1",
+			expectedSpec: &ECSApplicationSpec{
+				GenericApplicationSpec: GenericApplicationSpec{
+					Timeout: Duration(6 * time.Hour),
+					Trigger: Trigger{
+						OnCommit: OnCommit{
+							Disabled: false,
+						},
+						OnCommand: OnCommand{
+							Disabled: false,
+						},
+						OnOutOfSync: OnOutOfSync{
+							Disabled:  newBoolPointer(true),
+							MinWindow: Duration(5 * time.Minute),
+						},
+						OnChain: OnChain{
+							Disabled: newBoolPointer(true),
+						},
+					},
+				},
+				Input: ECSDeploymentInput{
+					ServiceDefinitionFile: "/path/to/servicedef.yaml",
+					TaskDefinitionFile:    "/path/to/taskdef.yaml",
+					LaunchType:            "FARGATE",
+					AutoRollback:          newBoolPointer(true),
+					RunStandaloneTask:     newBoolPointer(true),
+					AccessType:            "SERVICE_DISCOVERY",
+				},
+			},
+			expectedError: nil,
+		},
+		{
+			fileName:           "testdata/application/ecs-app-invalid-access-type.yaml",
+			expectedKind:       KindECSApp,
+			expectedAPIVersion: "pipecd.dev/v1beta1",
+			expectedSpec: &ECSApplicationSpec{
+				GenericApplicationSpec: GenericApplicationSpec{
+					Timeout: Duration(6 * time.Hour),
+					Trigger: Trigger{
+						OnCommit: OnCommit{
+							Disabled: false,
+						},
+						OnCommand: OnCommand{
+							Disabled: false,
+						},
+						OnOutOfSync: OnOutOfSync{
+							Disabled:  newBoolPointer(true),
+							MinWindow: Duration(5 * time.Minute),
+						},
+						OnChain: OnChain{
+							Disabled: newBoolPointer(true),
+						},
+					},
+				},
+				Input: ECSDeploymentInput{
+					ServiceDefinitionFile: "/path/to/servicedef.yaml",
+					TaskDefinitionFile:    "/path/to/taskdef.yaml",
+					LaunchType:            "FARGATE",
+					AutoRollback:          newBoolPointer(true),
+					RunStandaloneTask:     newBoolPointer(true),
+					AccessType:            "XXX",
+				},
+			},
+			expectedError: fmt.Errorf("invalid accessType: XXX"),
+		},
 	}
 	for _, tc := range testcases {
 		t.Run(tc.fileName, func(t *testing.T) {
diff --git a/pkg/config/testdata/application/ecs-app-invalid-access-type.yaml b/pkg/config/testdata/application/ecs-app-invalid-access-type.yaml
new file mode 100644
index 0000000000..4f41eb974e
--- /dev/null
+++ b/pkg/config/testdata/application/ecs-app-invalid-access-type.yaml
@@ -0,0 +1,7 @@
+apiVersion: pipecd.dev/v1beta1
+kind: ECSApp
+spec:
+  input:
+    serviceDefinitionFile: /path/to/servicedef.yaml
+    taskDefinitionFile: /path/to/taskdef.yaml
+    accessType: XXX
\ No newline at end of file
diff --git a/pkg/config/testdata/application/ecs-app-service-discovery.yaml b/pkg/config/testdata/application/ecs-app-service-discovery.yaml
new file mode 100644
index 0000000000..cc9da20611
--- /dev/null
+++ b/pkg/config/testdata/application/ecs-app-service-discovery.yaml
@@ -0,0 +1,7 @@
+apiVersion: pipecd.dev/v1beta1
+kind: ECSApp
+spec:
+  input:
+    serviceDefinitionFile: /path/to/servicedef.yaml
+    taskDefinitionFile: /path/to/taskdef.yaml
+    accessType: SERVICE_DISCOVERY
\ No newline at end of file