diff --git a/google/resource_cloudfunctions_function.go b/google/resource_cloudfunctions_function.go
index b4418936..7d736533 100644
--- a/google/resource_cloudfunctions_function.go
+++ b/google/resource_cloudfunctions_function.go
@@ -268,6 +268,13 @@ func resourceCloudFunctionsFunction() *schema.Resource {
 				Computed: true,
 			},
 
+			"max_instances": {
+				Type:         schema.TypeInt,
+				Optional:     true,
+				Default:      0,
+				ValidateFunc: validation.IntAtLeast(0),
+			},
+
 			"project": {
 				Type:     schema.TypeString,
 				Optional: true,
@@ -366,6 +373,10 @@ func resourceCloudFunctionsCreate(d *schema.ResourceData, meta interface{}) erro
 		function.EnvironmentVariables = expandEnvironmentVariables(d)
 	}
 
+	if v, ok := d.GetOk("max_instances"); ok {
+		function.MaxInstances = int64(v.(int))
+	}
+
 	log.Printf("[DEBUG] Creating cloud function: %s", function.Name)
 	op, err := config.clientCloudFunctions.Projects.Locations.Functions.Create(
 		cloudFuncId.locationId(), function).Do()
@@ -432,7 +443,7 @@ func resourceCloudFunctionsRead(d *schema.ResourceData, meta interface{}) error
 	}
 
 	d.Set("event_trigger", flattenEventTrigger(function.EventTrigger))
-
+	d.Set("max_instances", function.MaxInstances)
 	d.Set("region", cloudFuncId.Region)
 	d.Set("project", cloudFuncId.Project)
 
@@ -500,7 +511,7 @@ func resourceCloudFunctionsUpdate(d *schema.ResourceData, meta interface{}) erro
 
 	if d.HasChange("environment_variables") {
 		function.EnvironmentVariables = expandEnvironmentVariables(d)
-		updateMaskArr = append(updateMaskArr, "environment_variables")
+		updateMaskArr = append(updateMaskArr, "environmentVariables")
 	}
 
 	if d.HasChange("event_trigger") {
@@ -508,6 +519,11 @@ func resourceCloudFunctionsUpdate(d *schema.ResourceData, meta interface{}) erro
 		updateMaskArr = append(updateMaskArr, "eventTrigger", "eventTrigger.failurePolicy.retry")
 	}
 
+	if d.HasChange("max_instances") {
+		function.MaxInstances = int64(d.Get("max_instances").(int))
+		updateMaskArr = append(updateMaskArr, "maxInstances")
+	}
+
 	if len(updateMaskArr) > 0 {
 		log.Printf("[DEBUG] Send Patch CloudFunction Configuration request: %#v", function)
 		updateMask := strings.Join(updateMaskArr, ",")
diff --git a/google/resource_cloudfunctions_function_test.go b/google/resource_cloudfunctions_function_test.go
index 6e336882..7fc64047 100644
--- a/google/resource_cloudfunctions_function_test.go
+++ b/google/resource_cloudfunctions_function_test.go
@@ -90,6 +90,8 @@ func TestAccCloudFunctionsFunction_basic(t *testing.T) {
 						"description", "test function"),
 					resource.TestCheckResourceAttr(funcResourceName,
 						"available_memory_mb", "128"),
+					resource.TestCheckResourceAttr(funcResourceName,
+						"max_instances", "10"),
 					testAccCloudFunctionsFunctionSource(fmt.Sprintf("gs://%s/index.zip", bucketName), &function),
 					testAccCloudFunctionsFunctionTrigger(FUNCTION_TRIGGER_HTTP, &function),
 					resource.TestCheckResourceAttr(funcResourceName,
@@ -157,6 +159,8 @@ func TestAccCloudFunctionsFunction_update(t *testing.T) {
 						"description", "test function updated"),
 					resource.TestCheckResourceAttr(funcResourceName,
 						"timeout", "91"),
+					resource.TestCheckResourceAttr(funcResourceName,
+						"max_instances", "15"),
 					testAccCloudFunctionsFunctionHasLabel("my-label", "my-updated-label-value", &function),
 					testAccCloudFunctionsFunctionHasLabel("a-new-label", "a-new-label-value", &function),
 					testAccCloudFunctionsFunctionHasEnvironmentVariable("TEST_ENV_VARIABLE",
@@ -498,6 +502,7 @@ resource "google_cloudfunctions_function" "function" {
   environment_variables = {
 	TEST_ENV_VARIABLE = "test-env-variable-value"
   }
+  max_instances = 10
 }
 `, bucketName, zipFilePath, functionName)
 }
@@ -532,6 +537,7 @@ resource "google_cloudfunctions_function" "function" {
 	TEST_ENV_VARIABLE = "test-env-variable-value"
 	NEW_ENV_VARIABLE = "new-env-variable-value"
   }
+  max_instances = 15
 }`, bucketName, zipFilePath, functionName)
 }
 
diff --git a/website/docs/r/cloudfunctions_function.html.markdown b/website/docs/r/cloudfunctions_function.html.markdown
index 28e048a1..98383e1c 100644
--- a/website/docs/r/cloudfunctions_function.html.markdown
+++ b/website/docs/r/cloudfunctions_function.html.markdown
@@ -80,6 +80,8 @@ The following arguments are supported:
 * `source_repository` - (Optional) Represents parameters related to source repository where a function is hosted.
   Cannot be set alongside `source_archive_bucket` or `source_archive_object`. Structure is documented below.
 
+* `max_instances` - (Optional) The limit on the maximum number of function instances that may coexist at a given time.
+
 The `event_trigger` block supports:
 
 * `event_type` - (Required) The type of event to observe. For example: `"google.storage.object.finalize"`.