diff --git a/README.md b/README.md
index 9dd20c8..c92faa9 100644
--- a/README.md
+++ b/README.md
@@ -46,8 +46,23 @@
 * `ATMOSPHERE_IMAGE`: The name or UUID of the image to be used for deploying the
   instances (defaults to `Ubuntu 20.04.3 LTS (x86_64) [2021-10-04]`).
 
-* `ATMOSPHERE_INSTANCE_TYPE`: The instance type used to deploy all of the
-  different instances (defaults to `v3-standard-4`).
+* `ATMOSPHERE_INSTANCE_TYPE`(Deprecated): The instance type used to deploy all of the
+  different instances.(It doesn't have its own default value.)
+  This has been deprecated from v1.4.0. You can configure the instance type per a
+  machine role using `ATMOSPHERE_CONTROLLER_INSTANCE_TYPE`,
+  `ATMOSPHERE_COMPUTE_INSTANCE_TYPE`, and `ATMOSPHERE_STORAGE_INSTANCE_TYPE`
+  variables. For backwards compatibility, if variables specific to the machine roles
+  are not set and `ATMOSPHERE_INSTANCE_TYPE` is set, `ATMOSPHERE_INSTANCE_TYPE` value
+  is used.
+
+* `ATMOSPHERE_CONTROLLER_INSTANCE_TYPE`: The instance type used to deploy controller
+  instances (defaults to `v3-standard-16`).
+
+* `ATMOSPHERE_COMPUTE_INSTANCE_TYPE`: The instance type used to deploy compute
+  instances (defaults to `v3-standard-4`).
+
+* `ATMOSPHERE_STORAGE_INSTANCE_TYPE`: The instance type used to deploy storage
+  instances (defaults to `v3-standard-4`).
 
 * `ATMOSPHERE_NAMESERVERS`: A comma-separated list of nameservers to be used for
   the instances (defaults to `1.1.1.1`).
diff --git a/molecule/default/create.yml b/molecule/default/create.yml
index 557e88b..f7e579b 100644
--- a/molecule/default/create.yml
+++ b/molecule/default/create.yml
@@ -28,7 +28,9 @@
     stack_name: "{{ lookup('env', 'ATMOSPHERE_STACK_NAME') | default('atmosphere', True) }}"
     public_network: "{{ lookup('env', 'ATMOSPHERE_PUBLIC_NETWORK') | default('public', True) }}"
     image: "{{ lookup('env', 'ATMOSPHERE_IMAGE') | default('Ubuntu 20.04.3 LTS (x86_64) [2021-10-04]', True) }}"
-    instance_type: "{{ lookup('env', 'ATMOSPHERE_INSTANCE_TYPE') | default('v3-standard-4', True) }}"
+    controller_instance_type: "{{ lookup('env', 'ATMOSPHERE_CONTROLLER_INSTANCE_TYPE') | lookup('env', 'ATMOSPHERE_INSTANCE_TYPE') | default('v3-standard-16', True) }}"
+    compute_instance_type: "{{ lookup('env', 'ATMOSPHERE_COMPUTE_INSTANCE_TYPE') | lookup('env', 'ATMOSPHERE_INSTANCE_TYPE') | default('v3-standard-4', True) }}"
+    storage_instance_type: "{{ lookup('env', 'ATMOSPHERE_STORAGE_INSTANCE_TYPE') | lookup('env', 'ATMOSPHERE_INSTANCE_TYPE') | default('v3-standard-4', True) }}"
     nameservers: "{{ lookup('env', 'ATMOSPHERE_NAMESERVERS') | default('1.1.1.1', True) }}"
     boot_from_volume: "{{ lookup('env', 'ATMOSPHERE_BOOT_FROM_VOLUME') | bool }}"
     create_bastion_host: "{{ lookup('env', 'ATMOSPHERE_CREATE_BASTION_HOST') | bool }}"
@@ -40,7 +42,9 @@
         parameters:
           public_network: "{{ public_network }}"
           image: "{{ image }}"
-          instance_type: "{{ instance_type }}"
+          controller_instance_type: "{{ controller_instance_type }}"
+          compute_instance_type: "{{ compute_instance_type }}"
+          storage_instance_type: "{{ storage_instance_type }}"
           nameservers: "{{ nameservers }}"
           boot_from_volume: "{{  boot_from_volume }}"
           create_bastion_host: "{{ create_bastion_host }}"
diff --git a/molecule/default/heat/stack.yaml b/molecule/default/heat/stack.yaml
index cfdfde9..01b57fd 100644
--- a/molecule/default/heat/stack.yaml
+++ b/molecule/default/heat/stack.yaml
@@ -48,7 +48,23 @@
     type: boolean
     default: false
 
-  instance_type:
+  bastion_instance_type:
+    default: v3-standard-4
+    type: string
+    constraints:
+      - custom_constraint: nova.flavor
+
+  controller_instance_type:
+    type: string
+    constraints:
+      - custom_constraint: nova.flavor
+
+  compute_instance_type:
+    type: string
+    constraints:
+      - custom_constraint: nova.flavor
+
+  storage_instance_type:
     type: string
     constraints:
       - custom_constraint: nova.flavor
@@ -129,7 +145,7 @@
       name: bastion
       index: -1
       image: { get_param: image }
-      instance_type: { get_param: instance_type }
+      instance_type: { get_param: bastion_instance_type }
       key_name: { get_resource: key_pair }
       internal_network: { get_resource: internal_network }
       public_network: { get_param: public_network }
@@ -149,7 +165,7 @@
           name: ctl
           index: "%index%"
           image: { get_param: image }
-          instance_type: { get_param: instance_type }
+          instance_type: { get_param: controller_instance_type }
           key_name: { get_resource: key_pair }
           internal_network: { get_resource: internal_network }
           public_network: { get_param: public_network }
@@ -169,7 +185,7 @@
           name: nvme
           index: "%index%"
           image: { get_param: image }
-          instance_type: { get_param: instance_type }
+          instance_type: { get_param: storage_instance_type }
           key_name: { get_resource: key_pair }
           internal_network: { get_resource: internal_network }
           public_network: { get_param: public_network }
@@ -191,7 +207,7 @@
           name: kvm
           index: "%index%"
           image: { get_param: image }
-          instance_type: { get_param: instance_type }
+          instance_type: { get_param: compute_instance_type }
           key_name: { get_resource: key_pair }
           internal_network: { get_resource: internal_network }
           public_network: { get_param: public_network }