diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b63baf8..6f306da 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -103,14 +103,14 @@ jobs:
         uses: ./
         with:
           depth: ''
-          checkout_dir: step.authoer
+          checkout_dir: step.author
 
       - name: Have user.name and user.email on .git/config?
         run: |
           set -xe
           pwd
           ls -al
-          pushd step.authoer
+          pushd step.author
             if [ "${GITHUB_ACTOR}" != "$(git config --local --get user.name)" ]; then
               echo '::error:: "git config --local --get user.name" Should be equal' "$GITHUB_ACTOR"
               exit 1
@@ -154,6 +154,32 @@ jobs:
             exit 1
           fi
 
+      - name: Test Write checkout dir to safe.dirctory on .gitconfig
+        uses: ./
+        with:
+          depth: ''
+          checkout_dir: step.checkout-dir
+
+      - name: Have a current directory in safe.directory on .gitconfig
+        run: |
+          set -xe
+          pwd
+          SAFE_DIRECTORIES=$(git config --get-all safe.directory)
+          EXPECT="$(pwd)/step.checkout-dir"
+
+          FOUND=false
+          for s in $SAFE_DIRECTORIES; do
+            if [ "$s" = "$EXPECT" ]; then
+              FOUND=true
+            fi
+          done
+
+          if [ "$FOUND" = 'false' ]; then
+            echo "::error:: safe.directory内に $EXPECT が見つかりません"
+            echo "$SAFE_DIRECTORIES"
+            exit 1
+          fi
+
       - name: Setup github.com connection
         continue-on-error: true
         run: |
diff --git a/action.yml b/action.yml
index b2ad9fe..ee395dd 100644
--- a/action.yml
+++ b/action.yml
@@ -27,7 +27,7 @@ inputs:
     default: false
   checkout_dir:
     description: 'Name of directory to check out'
-    required: true
+    default: '.'
   depth:
     description: 'git clone --depth={} option'
     default: ''
@@ -80,7 +80,7 @@ runs:
             https://${{ inputs.github_actor }}:${{ inputs.github_token }}@github.com/${{ inputs.github_repository }}.git \
             ${{ inputs.checkout_dir }}
 
-        CHECKOUT_FULL_PATH="$(pwd)${{ inputs.checkout_dir }})"
+        CHECKOUT_FULL_PATH="$(pwd)/${{ inputs.checkout_dir }}"
         CHECKOUT_FULL_PATH="$(realpath $CHECKOUT_FULL_PATH)"
         if [ $(git config --global --get-all safe.directory | grep -c "${CHECKOUT_FULL_PATH}$") -eq 0 ]; then
           /usr/bin/git config --global --add safe.directory "${CHECKOUT_FULL_PATH}"