diff --git a/.changeset/big-countries-arrive.md b/.changeset/big-countries-arrive.md
new file mode 100644
index 000000000..6a55abb24
--- /dev/null
+++ b/.changeset/big-countries-arrive.md
@@ -0,0 +1,5 @@
+---
+"ingred-ui": major
+---
+
+Set weektime component to start on Monday
diff --git a/src/components/WeekTime/WeekTime/__tests__/__snapshots__/WeekTime.test.tsx.snap b/src/components/WeekTime/WeekTime/__tests__/__snapshots__/WeekTime.test.tsx.snap
index bc7109af6..ee6f4fe3e 100644
--- a/src/components/WeekTime/WeekTime/__tests__/__snapshots__/WeekTime.test.tsx.snap
+++ b/src/components/WeekTime/WeekTime/__tests__/__snapshots__/WeekTime.test.tsx.snap
@@ -134,7 +134,7 @@ exports[`WeekTime component testing WeekTime 1`] = `
       <div
         class="sc-hKMtZM sc-eCYdqJ ijKKtp gsFxfl"
       >
-        Sun
+        Mon
       </div>
       <span
         class="sc-gsnTZi iQtOmt"
@@ -211,7 +211,7 @@ exports[`WeekTime component testing WeekTime 1`] = `
       <div
         class="sc-hKMtZM sc-eCYdqJ ijKKtp gsFxfl"
       >
-        Mon
+        Tue
       </div>
       <span
         class="sc-gsnTZi iQtOmt"
@@ -288,7 +288,7 @@ exports[`WeekTime component testing WeekTime 1`] = `
       <div
         class="sc-hKMtZM sc-eCYdqJ ijKKtp gsFxfl"
       >
-        Tue
+        Wed
       </div>
       <span
         class="sc-gsnTZi iQtOmt"
@@ -365,7 +365,7 @@ exports[`WeekTime component testing WeekTime 1`] = `
       <div
         class="sc-hKMtZM sc-eCYdqJ ijKKtp gsFxfl"
       >
-        Wed
+        Thu
       </div>
       <span
         class="sc-gsnTZi iQtOmt"
@@ -442,7 +442,7 @@ exports[`WeekTime component testing WeekTime 1`] = `
       <div
         class="sc-hKMtZM sc-eCYdqJ ijKKtp gsFxfl"
       >
-        Thu
+        Fri
       </div>
       <span
         class="sc-gsnTZi iQtOmt"
@@ -519,7 +519,7 @@ exports[`WeekTime component testing WeekTime 1`] = `
       <div
         class="sc-hKMtZM sc-eCYdqJ ijKKtp gsFxfl"
       >
-        Fri
+        Sat
       </div>
       <span
         class="sc-gsnTZi iQtOmt"
@@ -596,7 +596,7 @@ exports[`WeekTime component testing WeekTime 1`] = `
       <div
         class="sc-hKMtZM sc-eCYdqJ ijKKtp gsFxfl"
       >
-        Sat
+        Sun
       </div>
       <span
         class="sc-gsnTZi iQtOmt"
diff --git a/src/components/WeekTime/WeekTimeSelector/__tests__/__snapshots__/WeekTimeSelector.test.tsx.snap b/src/components/WeekTime/WeekTimeSelector/__tests__/__snapshots__/WeekTimeSelector.test.tsx.snap
index fb1055cea..d4613de2a 100644
--- a/src/components/WeekTime/WeekTimeSelector/__tests__/__snapshots__/WeekTimeSelector.test.tsx.snap
+++ b/src/components/WeekTime/WeekTimeSelector/__tests__/__snapshots__/WeekTimeSelector.test.tsx.snap
@@ -134,7 +134,7 @@ exports[`WeekTimeSelector component testing WeekTimeSelector 1`] = `
       <div
         class="sc-iBkjds sc-ftvSup ddDNOR fStWin"
       >
-        Sun
+        Mon
       </div>
       <button
         class="sc-gsnTZi ipHfAH"
@@ -211,7 +211,7 @@ exports[`WeekTimeSelector component testing WeekTimeSelector 1`] = `
       <div
         class="sc-iBkjds sc-ftvSup ddDNOR fStWin"
       >
-        Mon
+        Tue
       </div>
       <button
         class="sc-gsnTZi ipHfAH"
@@ -288,7 +288,7 @@ exports[`WeekTimeSelector component testing WeekTimeSelector 1`] = `
       <div
         class="sc-iBkjds sc-ftvSup ddDNOR fStWin"
       >
-        Tue
+        Wed
       </div>
       <button
         class="sc-gsnTZi ipHfAH"
@@ -365,7 +365,7 @@ exports[`WeekTimeSelector component testing WeekTimeSelector 1`] = `
       <div
         class="sc-iBkjds sc-ftvSup ddDNOR fStWin"
       >
-        Wed
+        Thu
       </div>
       <button
         class="sc-gsnTZi ipHfAH"
@@ -442,7 +442,7 @@ exports[`WeekTimeSelector component testing WeekTimeSelector 1`] = `
       <div
         class="sc-iBkjds sc-ftvSup ddDNOR fStWin"
       >
-        Thu
+        Fri
       </div>
       <button
         class="sc-gsnTZi ipHfAH"
@@ -519,7 +519,7 @@ exports[`WeekTimeSelector component testing WeekTimeSelector 1`] = `
       <div
         class="sc-iBkjds sc-ftvSup ddDNOR fStWin"
       >
-        Fri
+        Sat
       </div>
       <button
         class="sc-gsnTZi ipHfAH"
@@ -596,7 +596,7 @@ exports[`WeekTimeSelector component testing WeekTimeSelector 1`] = `
       <div
         class="sc-iBkjds sc-ftvSup ddDNOR fStWin"
       >
-        Sat
+        Sun
       </div>
       <button
         class="sc-gsnTZi ipHfAH"
diff --git a/src/constants/locale.ts b/src/constants/locale.ts
index abc5a8078..0455b39d3 100644
--- a/src/constants/locale.ts
+++ b/src/constants/locale.ts
@@ -149,12 +149,12 @@ export const jaJP: Localization = {
     },
     WeekTime: {
       defaultProps: {
-        weekList: ["日", "月", "火", "水", "木", "金", "土"],
+        weekList: ["月", "火", "水", "木", "金", "土", "日"],
       },
     },
     WeekTimeSelector: {
       defaultProps: {
-        weekList: ["日", "月", "火", "水", "木", "金", "土"],
+        weekList: ["月", "火", "水", "木", "金", "土", "日"],
       },
     },
     DualListBox: {
@@ -202,12 +202,12 @@ export const enUS: Localization = {
     },
     WeekTime: {
       defaultProps: {
-        weekList: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
+        weekList: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
       },
     },
     WeekTimeSelector: {
       defaultProps: {
-        weekList: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
+        weekList: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
       },
     },
     DualListBox: {