diff --git a/app/Kintone/Models/SeasonTicketContract.php b/app/Kintone/Models/SeasonTicketContract.php
index 44659c2..1549e7a 100644
--- a/app/Kintone/Models/SeasonTicketContract.php
+++ b/app/Kintone/Models/SeasonTicketContract.php
@@ -14,6 +14,7 @@ class SeasonTicketContract extends KintoneModel
     const FIELD_VEHICLE_NO = "車両番号";
     const FIELD_CONTRACT_START_DATE = "契約日";
     const FIELD_CONTRACT_END_DATE = "解約日";
+    const FIELD_CONTRACT_AMOUNT = "契約金額";
 
     protected const FIELDS = [
         ...parent::FIELDS,
@@ -22,6 +23,7 @@ class SeasonTicketContract extends KintoneModel
         self::FIELD_VEHICLE_NO => FieldType::SINGLE_LINE_TEXT,
         self::FIELD_CONTRACT_START_DATE => FieldType::DATE,
         self::FIELD_CONTRACT_END_DATE => FieldType::DATE,
+        self::FIELD_CONTRACT_AMOUNT => FieldType::NUMBER,
     ];
 
     protected const FIELD_NAMES = [
@@ -30,5 +32,6 @@ class SeasonTicketContract extends KintoneModel
         self::FIELD_VEHICLE_NO => 'vehicle_no',
         self::FIELD_CONTRACT_START_DATE => 'contract_start_date',
         self::FIELD_CONTRACT_END_DATE => 'contract_end_date',
+        self::FIELD_CONTRACT_AMOUNT => 'contract_amount',
     ];
 }