diff --git a/ecs/jskult-webapp/src/model/view/ultmarc_doctor_search_view_model.py b/ecs/jskult-webapp/src/model/view/ultmarc_doctor_search_view_model.py
index a623381e..85b3dcf4 100644
--- a/ecs/jskult-webapp/src/model/view/ultmarc_doctor_search_view_model.py
+++ b/ecs/jskult-webapp/src/model/view/ultmarc_doctor_search_view_model.py
@@ -1,5 +1,4 @@
 import json
-from typing import Optional
 
 from pydantic import BaseModel
 
@@ -11,10 +10,10 @@ from src.system_var import environment
 
 class UltmarcDoctorSearchViewModel(BaseModel):
     subtitle: str = '医師検索一覧'
-    is_batch_processing: Optional[bool]
+    is_batch_processing: bool = None
     prefc_models: list[PrefcMasterModel]
-    doctor_data: Optional[list[UltmarcDoctorDBModel]] = []
-    form_data: Optional[UltmarcDoctorSearchModel]
+    doctor_data: list[UltmarcDoctorDBModel] = None
+    form_data: UltmarcDoctorSearchModel = None
 
     def ultmarc_data_json_str(self):
         """アルトマーク医師データの検索結果を指定された件数ごとに分割しながら返す"""
@@ -119,10 +118,10 @@ class UltmarcDoctorSearchViewModel(BaseModel):
         return self.form_data is not None
 
     def is_data_empty(self):
-        return len(self.doctor_data) == 0
+        return self.doctor_data is None or len(self.doctor_data) == 0
 
     def is_data_overflow_max_length(self):
-        return len(self.doctor_data) > environment.ULTMARC_SEARCH_RESULT_MAX_COUNT
+        return self.doctor_data is not None and len(self.doctor_data) > environment.ULTMARC_SEARCH_RESULT_MAX_COUNT
 
     def _selected_value(self, form_value: str, current_value: str):
         return 'selected' if form_value == current_value else ''
diff --git a/ecs/jskult-webapp/src/model/view/ultmarc_inst_search_view_model.py b/ecs/jskult-webapp/src/model/view/ultmarc_inst_search_view_model.py
index b41c77cd..5b5d90c9 100644
--- a/ecs/jskult-webapp/src/model/view/ultmarc_inst_search_view_model.py
+++ b/ecs/jskult-webapp/src/model/view/ultmarc_inst_search_view_model.py
@@ -1,5 +1,4 @@
 import json
-from typing import Optional
 
 from pydantic import BaseModel
 
@@ -12,11 +11,11 @@ from src.system_var import environment
 
 class UltmarcInstSearchViewModel(BaseModel):
     subtitle: str = '施設検索一覧'
-    is_batch_processing: Optional[bool]
+    is_batch_processing: bool = None
     prefc_models: list[PrefcMasterModel]
     inst_div_models: list[InstDivMasterModel]
-    inst_data: Optional[list[UltmarcInstDBModel]] = []
-    form_data: Optional[UltmarcInstSearchModel]
+    inst_data: list[UltmarcInstDBModel] = None
+    form_data: UltmarcInstSearchModel = None
 
     def ultmarc_data_json_str(self):
         """アルトマーク施設データの検索結果を指定された件数ごとに分割しながら返す"""
@@ -119,10 +118,10 @@ class UltmarcInstSearchViewModel(BaseModel):
         return self.form_data is not None
 
     def is_data_empty(self):
-        return len(self.inst_data) == 0
+        return self.inst_data is None or len(self.inst_data) == 0
 
     def is_data_overflow_max_length(self):
-        return len(self.inst_data) >= environment.ULTMARC_SEARCH_RESULT_MAX_COUNT
+        return self.inst_data is not None and len(self.inst_data) >= environment.ULTMARC_SEARCH_RESULT_MAX_COUNT
 
     def _selected_value(self, form_value: str, current_value: str):
         return 'selected' if form_value == current_value else ''