diff --git a/docs/data/data-grid/localization/data.json b/docs/data/data-grid/localization/data.json
index f286b966870b..15945bbcef96 100644
--- a/docs/data/data-grid/localization/data.json
+++ b/docs/data/data-grid/localization/data.json
@@ -147,7 +147,7 @@
     "languageTag": "ja-JP",
     "importName": "jaJP",
     "localeName": "Japanese",
-    "missingKeysCount": 4,
+    "missingKeysCount": 0,
     "totalKeysCount": 122,
     "githubLink": "https://github.com/mui/mui-x/blob/master/packages/x-data-grid/src/locales/jaJP.ts"
   },
diff --git a/packages/x-data-grid/src/locales/jaJP.ts b/packages/x-data-grid/src/locales/jaJP.ts
index 0d80664e4021..00f626c51187 100644
--- a/packages/x-data-grid/src/locales/jaJP.ts
+++ b/packages/x-data-grid/src/locales/jaJP.ts
@@ -57,9 +57,9 @@ const jaJPGrid: Partial<GridLocaleText> = {
 
   // Filter operators text
   filterOperatorContains: '...を含む',
-  // filterOperatorDoesNotContain: 'does not contain',
+  filterOperatorDoesNotContain: '...を含まない',
   filterOperatorEquals: '...に等しい',
-  // filterOperatorDoesNotEqual: 'does not equal',
+  filterOperatorDoesNotEqual: '...に等しくない',
   filterOperatorStartsWith: '...で始まる',
   filterOperatorEndsWith: '...で終わる',
   filterOperatorIs: '...である',
@@ -80,9 +80,9 @@ const jaJPGrid: Partial<GridLocaleText> = {
 
   // Header filter operators text
   headerFilterOperatorContains: '含む',
-  // headerFilterOperatorDoesNotContain: 'Does not contain',
+  headerFilterOperatorDoesNotContain: '含まない',
   headerFilterOperatorEquals: '等しい',
-  // headerFilterOperatorDoesNotEqual: 'Does not equal',
+  headerFilterOperatorDoesNotEqual: '等しくない',
   headerFilterOperatorStartsWith: 'で始まる',
   headerFilterOperatorEndsWith: 'で終わる',
   headerFilterOperatorIs: 'である',