diff --git a/tabulous/_qt/_table/_base/_delegate.py b/tabulous/_qt/_table/_base/_delegate.py
index 45cb4d0..ed83fc3 100644
--- a/tabulous/_qt/_table/_base/_delegate.py
+++ b/tabulous/_qt/_table/_base/_delegate.py
@@ -4,7 +4,7 @@
 from qtpy.QtCore import Qt
 
 from ._table_base import QBaseTable
-from ._line_edit import QCellLiteralEdit
+from ._line_edit import QCellLiteralEdit, QCellLineEdit
 
 from tabulous._magicgui._timedelta import QTimeDeltaEdit
 
@@ -77,7 +77,9 @@ def createEditor(
                 td.setValue(value)
                 return td
             elif dtype == "object":
-                raise NotImplementedError("Cannot edit cell of object dtype.")
+                line = QCellLineEdit(parent, qtable_view.parentTable(), (row, col))
+                line.setFont(font)
+                return line
             else:
                 line = qtable_view._create_eval_editor(moveto=(row, col))
                 line.setFont(font)
diff --git a/tabulous/_qt/_table/_base/_line_edit.py b/tabulous/_qt/_table/_base/_line_edit.py
index 20e6b4c..7d83468 100644
--- a/tabulous/_qt/_table/_base/_line_edit.py
+++ b/tabulous/_qt/_table/_base/_line_edit.py
@@ -299,6 +299,9 @@ def eventFilter(self, o: QCellLiteralEdit, e: QtCore.QEvent):
                 return True
         return False
 
+class QCellLineEdit(_QTableLineEdit):
+    def _is_text_valid(self) -> bool:
+        return True
 
 class QCellLiteralEdit(_QTableLineEdit):
     """Line edit used for evaluating cell text."""