diff --git a/backend/apps/fields/views.py b/backend/apps/fields/views.py
index 58824cb..44d7df6 100644
--- a/backend/apps/fields/views.py
+++ b/backend/apps/fields/views.py
@@ -79,15 +79,28 @@ def import_yoshida_fields(request):
         created_count = 0
         updated_count = 0
 
+        def clean_int_str(val):
+            if pd.isna(val):
+                return None
+            s = str(val).strip()
+            if not s:
+                return None
+            if s.endswith('.0'):
+                s = s[:-2]
+            return s
+
         for _, row in df.iterrows():
             name = str(row.get('名称', '')).strip() if pd.notna(row.get('名称')) else ''
             
             if not name:
                 continue
 
-            raw_kyosai_k = str(int(row.get('細目_耕地番号', 0))) if pd.notna(row.get('細目_耕地番号')) else None
-            raw_kyosai_s = str(int(row.get('細目_分筆番号', 0))) if pd.notna(row.get('細目_分筆番号')) else None
-            raw_chusankan = str(int(row.get('中山間_ID', 0))) if pd.notna(row.get('中山間_ID')) else None
+            raw_kyosai_k = clean_int_str(row.get('細目_耕地番号'))
+            raw_kyosai_s = clean_int_str(row.get('細目_分筆番号'))
+            raw_chusankan_str = clean_int_str(row.get('中山間_ID'))
+            raw_chusankan_ids = []
+            if raw_chusankan_str:
+                raw_chusankan_ids = [cid.strip() for cid in raw_chusankan_str.split(',') if cid.strip()]
 
             area_tan = float(row.get('面積(反)', 0)) if pd.notna(row.get('面積(反)')) else 0
             area_m2 = int(area_tan * 1000) if area_tan else 0
@@ -99,7 +112,7 @@ def import_yoshida_fields(request):
                 'owner_name': str(row.get('地主', '')).strip() if pd.notna(row.get('地主')) else '',
                 'raw_kyosai_k_num': raw_kyosai_k,
                 'raw_kyosai_s_num': raw_kyosai_s,
-                'raw_chusankan_id': raw_chusankan,
+                'raw_chusankan_id': raw_chusankan_str,
             }
 
             field, created = Field.objects.update_or_create(
@@ -121,9 +134,11 @@ def import_yoshida_fields(request):
                 except OfficialKyosaiField.MultipleObjectsReturned:
                     pass
 
-            if raw_chusankan:
+            for cid in raw_chusankan_ids:
+                if not cid:
+                    continue
                 try:
-                    chusankan_record = OfficialChusankanField.objects.get(c_id=raw_chusankan)
+                    chusankan_record = OfficialChusankanField.objects.get(c_id=cid)
                     field.chusankan_fields.add(chusankan_record)
                 except OfficialChusankanField.DoesNotExist:
                     pass
@@ -155,17 +170,29 @@ def import_chusankan_master(request):
         updated_count = 0
 
         for _, row in df.iterrows():
-            c_id = str(row.get('ID', '')).strip() if pd.notna(row.get('ID')) else ''
+            raw_id = row.get('ID')
+            c_id = str(raw_id).strip() if pd.notna(raw_id) else ''
             
             if not c_id:
                 continue
+            if not any(char.isdigit() for char in c_id):
+                continue
+
+            try:
+                payment_amount_val = row.get('交付金額')
+                if pd.notna(payment_amount_val):
+                    payment_amount = int(payment_amount_val)
+                else:
+                    payment_amount = None
+            except (ValueError, TypeError):
+                payment_amount = None
 
             defaults = {
                 'oaza': str(row.get('大字', '')).strip() if pd.notna(row.get('大字')) else '',
                 'aza': str(row.get('字', '')).strip() if pd.notna(row.get('字')) else '',
                 'chiban': str(row.get('地番', '')).strip() if pd.notna(row.get('地番')) else '',
                 'area': float(row.get('農地面積', 0)) if pd.notna(row.get('農地面積')) else 0,
-                'payment_amount': int(row.get('交付金額', 0)) if pd.notna(row.get('交付金額')) else None,
+                'payment_amount': payment_amount,
             }
 
             obj, created = OfficialChusankanField.objects.update_or_create(
diff --git a/backend/chusankan.ods b/backend/chusankan.ods
new file mode 100644
index 0000000..d364a84
Binary files /dev/null and b/backend/chusankan.ods differ
diff --git a/backend/yoshida.ods b/backend/yoshida.ods
new file mode 100644
index 0000000..18b4f77
Binary files /dev/null and b/backend/yoshida.ods differ