diff --git a/docs/content/en/docs-dev/user-guide/managing-application/defining-app-configuration/lambda.md b/docs/content/en/docs-dev/user-guide/managing-application/defining-app-configuration/lambda.md
index c58fe6fbff..d6bf0a15e8 100644
--- a/docs/content/en/docs-dev/user-guide/managing-application/defining-app-configuration/lambda.md
+++ b/docs/content/en/docs-dev/user-guide/managing-application/defining-app-configuration/lambda.md
@@ -34,6 +34,10 @@ spec:
     app: simple
   environments:
     FOO: bar
+  # ephemeralStorage is optional value. If you define a ephemeral storage to lambda, you can
+  # use this field. The value must be in between 512 to 10240 MB.
+  ephemeralStorage:
+    size: 512
   # vpcConfig is optional value. If you define a vpc configuration to lambda, you can
   # use this field.
   vpcConfig:
diff --git a/pkg/app/piped/platformprovider/lambda/client.go b/pkg/app/piped/platformprovider/lambda/client.go
index d015c167ae..607b110a0b 100644
--- a/pkg/app/piped/platformprovider/lambda/client.go
+++ b/pkg/app/piped/platformprovider/lambda/client.go
@@ -126,6 +126,9 @@ func (c *client) CreateFunction(ctx context.Context, fm FunctionManifest) error
 		}
 		input.Architectures = architectures
 	}
+	if fm.Spec.EphemeralStorage != nil {
+		input.EphemeralStorage.Size = aws.Int32(fm.Spec.EphemeralStorage.Size)
+	}
 	if fm.Spec.VPCConfig != nil {
 		input.VpcConfig = &types.VpcConfig{
 			SecurityGroupIds: fm.Spec.VPCConfig.SecurityGroupIDs,
@@ -179,7 +182,9 @@ func (c *client) CreateFunctionFromSource(ctx context.Context, fm FunctionManife
 			Variables: fm.Spec.Environments,
 		},
 	}
-
+	if fm.Spec.EphemeralStorage != nil {
+		input.EphemeralStorage.Size = aws.Int32(fm.Spec.EphemeralStorage.Size)
+	}
 	_, err = c.client.CreateFunction(ctx, input)
 	if err != nil {
 		return fmt.Errorf("failed to create Lambda function %s: %w", fm.Spec.Name, err)
@@ -278,6 +283,9 @@ func (c *client) updateFunctionConfiguration(ctx context.Context, fm FunctionMan
 		if fm.Spec.Handler != "" {
 			configInput.Handler = aws.String(fm.Spec.Handler)
 		}
+		if fm.Spec.EphemeralStorage != nil {
+			configInput.EphemeralStorage.Size = aws.Int32(fm.Spec.EphemeralStorage.Size)
+		}
 		if fm.Spec.VPCConfig != nil {
 			configInput.VpcConfig = &types.VpcConfig{
 				SecurityGroupIds: fm.Spec.VPCConfig.SecurityGroupIDs,
diff --git a/pkg/app/piped/platformprovider/lambda/function.go b/pkg/app/piped/platformprovider/lambda/function.go
index a6e4d70206..51e8448311 100644
--- a/pkg/app/piped/platformprovider/lambda/function.go
+++ b/pkg/app/piped/platformprovider/lambda/function.go
@@ -30,9 +30,11 @@ const (
 	functionManifestKind = "LambdaFunction"
 	// Memory and Timeout lower and upper limit as noted via
 	// https://docs.aws.amazon.com/sdk-for-go/api/service/lambda/#UpdateFunctionConfigurationInput
-	memoryLowerLimit  = 1
-	timeoutLowerLimit = 1
-	timeoutUpperLimit = 900
+	memoryLowerLimit           = 1
+	timeoutLowerLimit          = 1
+	timeoutUpperLimit          = 900
+	ephemeralStorageLowerLimit = 512
+	ephemeralStorageUpperLimit = 10240
 )
 
 type FunctionManifest struct {
@@ -56,21 +58,22 @@ func (fm *FunctionManifest) validate() error {
 
 // FunctionManifestSpec contains configuration for LambdaFunction.
 type FunctionManifestSpec struct {
-	Name            string            `json:"name"`
-	Role            string            `json:"role"`
-	ImageURI        string            `json:"image"`
-	S3Bucket        string            `json:"s3Bucket"`
-	S3Key           string            `json:"s3Key"`
-	S3ObjectVersion string            `json:"s3ObjectVersion"`
-	SourceCode      SourceCode        `json:"source"`
-	Handler         string            `json:"handler"`
-	Architectures   []Architecture    `json:"architectures,omitempty"`
-	Runtime         string            `json:"runtime"`
-	Memory          int32             `json:"memory"`
-	Timeout         int32             `json:"timeout"`
-	Tags            map[string]string `json:"tags,omitempty"`
-	Environments    map[string]string `json:"environments,omitempty"`
-	VPCConfig       *VPCConfig        `json:"vpcConfig,omitempty"`
+	Name             string            `json:"name"`
+	Role             string            `json:"role"`
+	ImageURI         string            `json:"image"`
+	S3Bucket         string            `json:"s3Bucket"`
+	S3Key            string            `json:"s3Key"`
+	S3ObjectVersion  string            `json:"s3ObjectVersion"`
+	SourceCode       SourceCode        `json:"source"`
+	Handler          string            `json:"handler"`
+	Architectures    []Architecture    `json:"architectures,omitempty"`
+	EphemeralStorage *EphemeralStorage `json:"ephemeralStorage,omitempty"`
+	Runtime          string            `json:"runtime"`
+	Memory           int32             `json:"memory"`
+	Timeout          int32             `json:"timeout"`
+	Tags             map[string]string `json:"tags,omitempty"`
+	Environments     map[string]string `json:"environments,omitempty"`
+	VPCConfig        *VPCConfig        `json:"vpcConfig,omitempty"`
 }
 
 type VPCConfig struct {
@@ -100,6 +103,11 @@ func (fmp FunctionManifestSpec) validate() error {
 			return fmt.Errorf("architecture is invalid: %w", err)
 		}
 	}
+	if fmp.EphemeralStorage != nil {
+		if err := fmp.EphemeralStorage.validate(); err != nil {
+			return fmt.Errorf("ephemeral storage is invalid: %w", err)
+		}
+	}
 	if fmp.Role == "" {
 		return fmt.Errorf("role is missing")
 	}
@@ -139,6 +147,17 @@ func (a Architecture) validate() error {
 	return nil
 }
 
+type EphemeralStorage struct {
+	Size int32 `json:"size,omitempty"`
+}
+
+func (es EphemeralStorage) validate() error {
+	if es.Size < ephemeralStorageLowerLimit || es.Size > ephemeralStorageUpperLimit {
+		return fmt.Errorf("ephemeral storage is out of range")
+	}
+	return nil
+}
+
 func loadFunctionManifest(path string) (FunctionManifest, error) {
 	data, err := os.ReadFile(path)
 	if err != nil {
diff --git a/pkg/app/piped/platformprovider/lambda/function_test.go b/pkg/app/piped/platformprovider/lambda/function_test.go
index eefbb3ed2b..8c9a5134a4 100644
--- a/pkg/app/piped/platformprovider/lambda/function_test.go
+++ b/pkg/app/piped/platformprovider/lambda/function_test.go
@@ -99,6 +99,36 @@ func TestParseFunctionManifest(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "correct config for LambdaFunction with specifying ephemeral storage",
+			data: `{
+  "apiVersion": "pipecd.dev/v1beta1",
+  "kind": "LambdaFunction",
+  "spec": {
+	  "name": "SimpleFunction",
+	  "role": "arn:aws:iam::xxxxx:role/lambda-role",
+	  "memory": 128,
+	  "timeout": 5,
+	  "image": "ecr.region.amazonaws.com/lambda-simple-function:v0.0.1",
+	  "ephemeralStorage": {
+		size: 512
+	  }
+  }
+}`,
+			wantSpec: FunctionManifest{
+				Kind:       "LambdaFunction",
+				APIVersion: "pipecd.dev/v1beta1",
+				Spec: FunctionManifestSpec{
+					Name:             "SimpleFunction",
+					Role:             "arn:aws:iam::xxxxx:role/lambda-role",
+					Memory:           128,
+					Timeout:          5,
+					ImageURI:         "ecr.region.amazonaws.com/lambda-simple-function:v0.0.1",
+					EphemeralStorage: &EphemeralStorage{Size: 512},
+				},
+			},
+			wantErr: false,
+		},
 		{
 			name: "correct config for LambdaFunction with specifying vpc config",
 			data: `{
@@ -170,6 +200,25 @@ func TestParseFunctionManifest(t *testing.T) {
 	  "timeout": 1000,
 	  "image": "ecr.region.amazonaws.com/lambda-simple-function:v0.0.1"
   }
+}`,
+			wantSpec: FunctionManifest{},
+			wantErr:  true,
+		},
+		{
+			name: "invalid ephemeral storage value",
+			data: `{
+  "apiVersion": "pipecd.dev/v1beta1",
+  "kind": "LambdaFunction",
+  "spec": {
+	  "name": "SimpleFunction",
+	  "role": "arn:aws:iam::xxxxx:role/lambda-role",
+	  "memory": 128,
+	  "timeout": 5,
+	  "image": "ecr.region.amazonaws.com/lambda-simple-function:v0.0.1",
+	  "ephemeralStorage": {
+		size: 511
+	  }
+  }
 }`,
 			wantSpec: FunctionManifest{},
 			wantErr:  true,