diff --git a/src/custom-functions/bcode-result.test.ts b/src/custom-functions/bcode-result.test.ts
index 122a6dc..95dcc49 100644
--- a/src/custom-functions/bcode-result.test.ts
+++ b/src/custom-functions/bcode-result.test.ts
@@ -34,6 +34,6 @@ test('format', () => {
     '430,602,000,000円'
   )
 
-  expect(new BcodeResult(null, '百万円').format(true, false)).toBe('N/A')
-  expect(new BcodeResult(null, '百万円').format(true, true)).toBe('N/A')
+  expect(new BcodeResult(null, '百万円').format(true, false)).toBe('')
+  expect(new BcodeResult(null, '百万円').format(true, true)).toBe('')
 })
diff --git a/src/custom-functions/bcode-result.ts b/src/custom-functions/bcode-result.ts
index 6192253..ad7ae35 100644
--- a/src/custom-functions/bcode-result.ts
+++ b/src/custom-functions/bcode-result.ts
@@ -7,7 +7,7 @@ export class BcodeResult {
     let value = this.value
 
     if (value === null) {
-      return 'N/A'
+      return ''
     }
 
     if (typeof value === 'number' && this.unit === '百万円') {