diff --git a/shimatta_kenkyusho/parts/forms.py b/shimatta_kenkyusho/parts/forms.py
index 1cbfbae..504d763 100644
--- a/shimatta_kenkyusho/parts/forms.py
+++ b/shimatta_kenkyusho/parts/forms.py
@@ -79,6 +79,7 @@ class AddStockForm(forms.Form):
     watermark = forms.IntegerField(min_value=0, required=True, initial=0)
     amount = forms.IntegerField(min_value=0, required=True, initial=1)
     component_uuid = forms.UUIDField(required=True)
+    lot = forms.CharField(max_length=255, required=False)
 
     def clean(self):
         cleaned_data = super().clean()
@@ -103,7 +104,7 @@ class AddStockForm(forms.Form):
         if self.cleaned_data.get('watermark_active'):
             watermark = self.cleaned_data.get('watermark')
 
-        new_stock = parts_models.Stock.objects.create(storage=storage, component=component, watermark=watermark, amount=amount)
+        new_stock = parts_models.Stock.objects.create(storage=storage, component=component, watermark=watermark, amount=amount, lot=self.cleaned_data['lot'])
         new_stock.save()
         
 class EditComponentForm(forms.Form):
diff --git a/shimatta_kenkyusho/templates/parts/modals/add-stock-modal.html b/shimatta_kenkyusho/templates/parts/modals/add-stock-modal.html
index a617aa7..d9755bd 100644
--- a/shimatta_kenkyusho/templates/parts/modals/add-stock-modal.html
+++ b/shimatta_kenkyusho/templates/parts/modals/add-stock-modal.html
@@ -33,6 +33,15 @@ Input context:
                         {% endfor %}
                         </div>
                     </div>
+                    <div class="mb-3">
+                        <label for="add-stock-form-lot" class="form-label">Lot</label>
+                        <input type="text" name="{{form.lot.html_name}}" id="add-stock-form-lot" class="form-control{% if form.lot.errors %} is-invalid{% endif %}" aria-describedby="add-stock-form-lot-err">
+                        <div id="add-stock-form-lot-err" class="invalid-feedback">
+                            {% for msg in form.lot.errors %}
+                                {{msg}}
+                            {% endfor %}
+                        </div>
+                    </div>
                     <div class="mb-3">
                         <label for="add-stock-form-watermark" class="form-label">Watermark</label>
                         <div class="input-group">
diff --git a/shimatta_kenkyusho/templates/parts/stocks-detail.html b/shimatta_kenkyusho/templates/parts/stocks-detail.html
index 374a25d..753812b 100644
--- a/shimatta_kenkyusho/templates/parts/stocks-detail.html
+++ b/shimatta_kenkyusho/templates/parts/stocks-detail.html
@@ -76,6 +76,9 @@
                             {% if stock.component.manufacturer %}
                                 Manufacturer: {{stock.component.manufacturer}}
                             {% endif %}
+                            {% if stock.lot %}
+                                <span class="text-secondary"><br>Lot: {{stock.lot}}</span>
+                            {% endif %}
                         </div>
                         <div class="ms-3">
                             Amount: {{stock.amount}}
@@ -92,7 +95,7 @@
                             <form method="post">
                                 {% csrf_token %}
                                 <input type="hidden" name="stock_uuid" value="{{stock.id}}">
-                                <input type="submit" class="btn btn-danger" name="submit-delete-stock" value="X">
+                                <input type="submit" class="btn btn-danger m-1" name="submit-delete-stock" value="X">
                             </form>
                         </div>
                     </li>