diff --git a/lib/sheetq/google_client.rb b/lib/sheetq/google_client.rb
index 490bf41..f9d724a 100644
--- a/lib/sheetq/google_client.rb
+++ b/lib/sheetq/google_client.rb
@@ -15,8 +15,11 @@ class AuthorizationError < StandardError ; end
     extend Forwardable
 
     def_delegators :@client,
+    :get_spreadsheet,
     :get_spreadsheet_values,
-    :append_spreadsheet_value
+    :append_spreadsheet_value,
+    :update_spreadsheet_value,
+    :batch_update_spreadsheet
 
     def initialize(client_id, client_secret, token_store_path, user, logger = nil)
       @client_id = client_id
diff --git a/lib/sheetq/service/sheet.rb b/lib/sheetq/service/sheet.rb
index 8150d42..a0d4281 100644
--- a/lib/sheetq/service/sheet.rb
+++ b/lib/sheetq/service/sheet.rb
@@ -15,6 +15,25 @@ def append_row(resource)
         spreadsheet.append_row(sheet_name, resource)
       end
 
+      def update_row(resource, row_num)
+        unless resource.is_a?(@resource_class)
+          fail "Invalid resource #{resource.class} to update sheet #{sheet_name}"
+        end
+        spreadsheet.update_row(sheet_name, resource, row_num)
+      end
+
+      def update_row_including_keyword(keyword, resource)
+        unless resource.is_a?(@resource_class)
+          fail "Invalid resource #{resource.class} to update sheet #{sheet_name}"
+        end
+        row_num = spreadsheet.get_row_num(sheet_name, keyword)
+        spreadsheet.update_row(sheet_name, resource, row_num)
+      end
+
+      def delete_row(row_num)
+        spreadsheet.delete_row(sheet_name, row_num)
+      end
+
       def fetch(range = nil)
         range = if range
                   sheet_name + "!" + range
diff --git a/lib/sheetq/service/spreadsheet.rb b/lib/sheetq/service/spreadsheet.rb
index 4d15ee4..8873381 100644
--- a/lib/sheetq/service/spreadsheet.rb
+++ b/lib/sheetq/service/spreadsheet.rb
@@ -11,6 +11,18 @@ def get_spreadsheet_values(range)
         client.get_spreadsheet_values(spreadsheet_id, range)
       end
 
+      def get_row_num(sheet_name, word)
+        row_num = nil
+        values = client.get_spreadsheet_values(spreadsheet_id, sheet_name).values
+        values.each_with_index do |row, index|
+          if row.any? { |cell| cell == word}
+            row_num = index + 1
+            return row_num
+            break
+          end
+        end
+      end
+
       def append_row(sheet_name, resource)
         # https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets.values/append
         # https://www.rubydoc.info/github/google/google-api-ruby-client/Google/Apis/SheetsV4/SheetsService#append_spreadsheet_value-instance_method
@@ -25,6 +37,39 @@ def append_row(sheet_name, resource)
         )
       end
 
+      def update_row(sheet_name, resource, row_num)
+        value_range_object = Google::Apis::SheetsV4::ValueRange.new(values: [resource.to_a])
+        target = 'A' + row_num.to_s
+        response = client.update_spreadsheet_value(
+          spreadsheet_id,
+          "#{sheet_name}!#{target}",
+          value_range_object,
+          value_input_option: "RAW"
+        )
+      end
+
+      def delete_row(sheet_name, row_num)
+        sheet_meta = client.get_spreadsheet(spreadsheet_id)
+        sheet = sheet_meta.sheets.find { |s| s.properties.title == sheet_name }
+        sheet_id = sheet.properties.sheet_id
+
+        delete_request = Google::Apis::SheetsV4::Request.new(
+          delete_dimension: Google::Apis::SheetsV4::DeleteDimensionRequest.new(
+            range: Google::Apis::SheetsV4::DimensionRange.new(
+              sheet_id: sheet_id,
+              dimension: "ROWS",
+              start_index: row_num - 1, # 0ベースに変換
+              end_index: row_num # 削除する行の次の行
+            )
+          )
+        )
+      
+        batch_update_request = Google::Apis::SheetsV4::BatchUpdateSpreadsheetRequest.new(
+          requests: [delete_request]
+        )
+        client.batch_update_spreadsheet(spreadsheet_id, batch_update_request)
+      end
+
       def sheet(sheet_name, resource_class = nil)
         Sheet.new(self, sheet_name, resource_class)
       end