diff --git a/dictation_client/src/common/parser.test.ts b/dictation_client/src/common/parser.test.ts
index d4aff39..a318a76 100644
--- a/dictation_client/src/common/parser.test.ts
+++ b/dictation_client/src/common/parser.test.ts
@@ -131,4 +131,23 @@ describe("parse", () => {
       expect(actualValue.role).toEqual(expectValue.role);
     }
   });
+
+  it("author_id,encryption_passwordが数値のみの場合でも、文字列として変換できる", async () => {
+    const text = fs.readFileSync("src/common/test/test_008.csv", "utf-8");
+    const actualData = await parseCSV(text);
+    const expectData: CSVType[] = [
+      {
+        name: "hoge",
+        email: "sample@example.com",
+        role: 1,
+        author_id: "1111",
+        auto_renew: 1,
+        notification: 1,
+        encryption: 1,
+        encryption_password: "222222",
+        prompt: 0,
+      },
+    ];
+    expect(actualData).toEqual(expectData);
+  });
 });
diff --git a/dictation_client/src/common/parser.ts b/dictation_client/src/common/parser.ts
index 15fe85b..30e0b43 100644
--- a/dictation_client/src/common/parser.ts
+++ b/dictation_client/src/common/parser.ts
@@ -42,7 +42,24 @@ export const parseCSV = async (csvString: string): Promise<CSVType[]> =>
       download: false,
       worker: false, // XXX: workerを使うとエラーが発生するためfalseに設定
       header: true,
-      dynamicTyping: true,
+      dynamicTyping: {
+        // author_id, encryption_passwordは数値のみの場合、numberに変換されたくないためdynamicTypingをtrueにしない
+        role: true,
+        auto_renew: true,
+        notification: true,
+        encryption: true,
+        prompt: true,
+      },
+      // dynamicTypingがfalseの場合、空文字をnullに変換できないためtransformを使用する
+      transform: (value, field) => {
+        if (field === "author_id" || field === "encryption_password") {
+          // 空文字の場合はnullに変換する
+          if (value === "") {
+            return null;
+          }
+        }
+        return value;
+      },
       complete: (results: ParseResult<CSVType>) => {
         // ヘッダーがCSVTypeFieldsと一致しない場合はエラーを返す
         if (!equals(results.meta.fields ?? [], CSVTypeFields)) {
diff --git a/dictation_client/src/common/test/test_008.csv b/dictation_client/src/common/test/test_008.csv
new file mode 100644
index 0000000..ccc9f52
--- /dev/null
+++ b/dictation_client/src/common/test/test_008.csv
@@ -0,0 +1,2 @@
+name,email,role,author_id,auto_renew,notification,encryption,encryption_password,prompt
+hoge,sample@example.com,1,1111,1,1,1,222222,0
\ No newline at end of file