diff --git a/README.md b/README.md
index 73cc8e8..432b41e 100644
--- a/README.md
+++ b/README.md
@@ -12,10 +12,8 @@ inputs:
     required: true
   if_true:
     description: 'output value if cond is true'
-    required: true
   if_false:
     description: 'output value if cond is false'
-    required: true
 outputs:
   value:
     description: 'output value'
diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index a0bf23c..38321af 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -24,3 +24,14 @@ test('test runs (false)', () => {
   }
   console.log(cp.execSync(`node ${ip}`, options).toString())
 })
+
+test('test runs (empty)', () => {
+  process.env['INPUT_COND'] = 'true'
+  process.env['INPUT_IF_TRUE'] = ''
+  process.env['INPUT_IF_FALSE'] = 'value-if-false'
+  const ip = path.join(__dirname, '..', 'lib', 'main.js')
+  const options: cp.ExecSyncOptions = {
+    env: process.env
+  }
+  console.log(cp.execSync(`node ${ip}`, options).toString())
+})
diff --git a/action.yml b/action.yml
index 47b90db..7783e50 100644
--- a/action.yml
+++ b/action.yml
@@ -1,5 +1,5 @@
-name: 'Conditional value for GitHub Action'
-description: 'Conditional value for GitHub Action - missing expression for GitHub Actions'
+name: 'Conditional value - missing expression for GitHub Actions'
+description: 'Conditional value - missing expression for GitHub Actions'
 author: 'haya14busa'
 inputs:
   cond:
@@ -7,10 +7,10 @@ inputs:
     required: true
   if_true:
     description: 'output value if cond is true'
-    required: true
+    default: ''
   if_false:
     description: 'output value if cond is false'
-    required: true
+    default: ''
 outputs:
   value:
     description: 'output value'
diff --git a/dist/index.js b/dist/index.js
index 3b298a0..efd68ef 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -77,8 +77,8 @@ function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
             const cond = core.getInput('cond', { required: true });
-            const ifTrue = core.getInput('if_true', { required: true });
-            const ifFalse = core.getInput('if_false', { required: true });
+            const ifTrue = core.getInput('if_true');
+            const ifFalse = core.getInput('if_false');
             core.setOutput('value', cond === 'true' ? ifTrue : ifFalse);
         }
         catch (error) {
diff --git a/src/main.ts b/src/main.ts
index 88e0fbb..9aed827 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -3,8 +3,8 @@ import * as core from '@actions/core'
 async function run(): Promise<void> {
   try {
     const cond: string = core.getInput('cond', {required: true})
-    const ifTrue: string = core.getInput('if_true', {required: true})
-    const ifFalse: string = core.getInput('if_false', {required: true})
+    const ifTrue: string = core.getInput('if_true')
+    const ifFalse: string = core.getInput('if_false')
     core.setOutput('value', cond === 'true' ? ifTrue : ifFalse)
   } catch (error) {
     core.setFailed(error.message)