diff --git a/src/Nirum/Package/Metadata.hs b/src/Nirum/Package/Metadata.hs
index 5c91a4a..1676b9d 100644
--- a/src/Nirum/Package/Metadata.hs
+++ b/src/Nirum/Package/Metadata.hs
@@ -78,6 +78,7 @@ import Text.Toml.Types (Node ( VArray
                              )
                        , Table
                        , VTArray
+                       , VArray
                        )
 import Text.URI (URI, parseURI)
 
@@ -104,7 +105,7 @@ data Metadata t =
     Metadata { version :: SV.Version
              , description :: Maybe Text
              , license :: Maybe Text
-             , keywords :: Maybe Text
+             , keywords :: [Text]
              , authors :: [Author]
              , target :: (Eq t, Ord t, Show t, Target t) => t
              }
@@ -186,7 +187,7 @@ parseMetadata metadataPath' tomlText = do
     authors' <- authorsField "authors" table
     description' <- optional $ stringField "description" table
     license' <- optional $ stringField "license" table
-    keywords' <- optional $ stringField "keywords" table
+    keywords' <- textArrayField "keywords" table
     targets <- case tableField "targets" table of
         Left (FieldError _) -> Right HM.empty
         otherwise' -> otherwise'
@@ -269,6 +270,20 @@ stringField = typedField "string" $ \ n -> case n of
                                                 VString s -> Just s
                                                 _ -> Nothing
 
+arrayField :: MetadataField -> Table -> Either MetadataError VArray
+arrayField f t =
+    case arrayF f t of
+        Right vector -> Right vector
+        Left (FieldError _) -> Right $ fromList []
+        Left error' -> Left error'
+  where
+    arrayF :: MetadataField -> Table -> Either MetadataError VArray
+    arrayF = typedField "array" $ \ node ->
+        case node of
+            VArray array -> Just array
+            _ -> Nothing
+
+
 tableArrayField :: MetadataField -> Table -> Either MetadataError VTArray
 tableArrayField f t =
     case arrayF f t of
@@ -306,6 +321,16 @@ versionField field' table = do
         Left _ -> Left $ FieldValueError field' $
                     "expected a semver string (e.g. \"1.2.3\"), not " ++ show s
 
+textArrayField :: MetadataField -> Table -> Either MetadataError [Text]
+textArrayField field' table = do
+    array <- arrayField field' table
+    textArray' <- mapM parseText array
+    return $ toList textArray'
+  where
+    parseText :: Node -> Either MetadataError Text
+    parseText (VString s) = Right s
+    parseText a = Left $ FieldTypeError field' "array" $ fieldType a
+
 authorsField :: MetadataField -> Table -> Either MetadataError [Author]
 authorsField field' table = do
     array <- tableArrayField field' table
diff --git a/src/Nirum/Targets/Python.hs b/src/Nirum/Targets/Python.hs
index f9a3040..38bbbd8 100644
--- a/src/Nirum/Targets/Python.hs
+++ b/src/Nirum/Targets/Python.hs
@@ -1209,9 +1209,9 @@ setup(
   where
     target' :: Python
     target' = target metadata'
-    csStrings :: [T.Text] -> T.Text
-    csStrings [] = "None"
-    csStrings s = stringLiteral $ T.intercalate ", " s
+    csStrings :: T.Text -> [T.Text] -> T.Text
+    csStrings _ [] = "None"
+    csStrings d s = stringLiteral $ T.intercalate d s
     pName :: Code
     pName = packageName $ target metadata'
     pVersion :: Code
@@ -1225,13 +1225,15 @@ setup(
     pLicense :: Code
     pLicense = fromMaybeToMeta $ license metadata'
     pKeywords :: Code
-    pKeywords = fromMaybeToMeta $ MD.keywords metadata'
+    pKeywords = csStrings " " $ MD.keywords metadata'
     strings :: [Code] -> Code
     strings values = T.intercalate ", " $ map stringLiteral (L.sort values)
     author :: Code
-    author = csStrings [aName | Author { name = aName } <- authors metadata']
+    author = csStrings ", " [aName
+                            | Author { name = aName } <- authors metadata'
+                            ]
     authorEmail :: Code
-    authorEmail = csStrings [ decodeUtf8 (E.toByteString e)
+    authorEmail = csStrings ", " [ decodeUtf8 (E.toByteString e)
                             | Author { email = Just e } <- authors metadata'
                             ]
     pPackages :: Code
diff --git a/test/Nirum/CodeBuilderSpec.hs b/test/Nirum/CodeBuilderSpec.hs
index a0357b0..4c4bfae 100644
--- a/test/Nirum/CodeBuilderSpec.hs
+++ b/test/Nirum/CodeBuilderSpec.hs
@@ -40,7 +40,7 @@ package = Package { metadata = Metadata { version = SV.version 0 0 1 [] []
                                         , authors = []
                                         , description = Nothing
                                         , license = Nothing
-                                        , keywords = Nothing
+                                        , keywords = []
                                         , target = DummyTarget
                                         }
                   , modules = modules'
diff --git a/test/Nirum/Package/MetadataSpec.hs b/test/Nirum/Package/MetadataSpec.hs
index e455c0b..2accc9f 100644
--- a/test/Nirum/Package/MetadataSpec.hs
+++ b/test/Nirum/Package/MetadataSpec.hs
@@ -136,11 +136,11 @@ spec =
                         , "integer (123)"
                         )
                       , ( [q|version = "1.2.3"
-                             keywords = 789
+                             keywords = "sample example nirum"
                           |]
                         , "keywords"
-                        , "string"
-                        , "integer (789)"
+                        , "array"
+                        , "string (sample example nirum)"
                         )
                       ] $ \ (toml, field, expected, actual) -> do
                         let Left e = parse toml
diff --git a/test/Nirum/PackageSpec.hs b/test/Nirum/PackageSpec.hs
index 97a56d8..8f8717c 100644
--- a/test/Nirum/PackageSpec.hs
+++ b/test/Nirum/PackageSpec.hs
@@ -65,7 +65,7 @@ createValidPackage t = createPackage Metadata { version = SV.initial
                                               , authors = []
                                               , description = Nothing
                                               , license = Nothing
-                                              , keywords = Nothing
+                                              , keywords = []
                                               , target = t
                                               } validModules
 
@@ -115,7 +115,7 @@ testPackage target' = do
                                          , authors = []
                                          , description = Nothing
                                          , license = Nothing
-                                         , keywords = Nothing
+                                         , keywords = []
                                          , target = target'
                                          }
                 metadata package `shouldBe` metadata'
diff --git a/test/Nirum/Targets/PythonSpec.hs b/test/Nirum/Targets/PythonSpec.hs
index fe73cf0..daeef5c 100644
--- a/test/Nirum/Targets/PythonSpec.hs
+++ b/test/Nirum/Targets/PythonSpec.hs
@@ -104,7 +104,7 @@ makeDummySource' pathPrefix m renames =
               ]
         , description = Just "Package description"
         , license = Just "MIT"
-        , keywords = Just "test example examples"
+        , keywords = ["sample", "example", "nirum"]
         , target = Python "sample-package" minimumRuntime renames
         }
     pkg :: Package Python
diff --git a/test/nirum_fixture/package.toml b/test/nirum_fixture/package.toml
index 1bf5214..79b9a3e 100644
--- a/test/nirum_fixture/package.toml
+++ b/test/nirum_fixture/package.toml
@@ -1,7 +1,7 @@
 version = "0.3.0"
 description = "Package description"
 license = "MIT"
-keywords = "test example examples"
+keywords = ["sample", "example", "nirum"]
 
 [[authors]]
 name = "nirum"