diff --git a/src/main/java/com/jaoafa/mymaid4/event/Event_AntiBigSlime.java b/src/main/java/com/jaoafa/mymaid4/event/Event_AntiBigSlime.java
new file mode 100644
index 000000000..99b756805
--- /dev/null
+++ b/src/main/java/com/jaoafa/mymaid4/event/Event_AntiBigSlime.java
@@ -0,0 +1,59 @@
+/*
+ * jaoLicense
+ *
+ * Copyright (c) 2022 jao Minecraft Server
+ *
+ * The following license applies to this project: jaoLicense
+ *
+ * Japanese: https://github.com/jaoafa/jao-Minecraft-Server/blob/master/jaoLICENSE.md
+ * English: https://github.com/jaoafa/jao-Minecraft-Server/blob/master/jaoLICENSE-en.md
+ */
+
+package com.jaoafa.mymaid4.event;
+
+import com.jaoafa.mymaid4.lib.EventPremise;
+import com.jaoafa.mymaid4.lib.MyMaidLibrary;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.entity.Slime;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+public class Event_AntiBigSlime extends MyMaidLibrary implements Listener, EventPremise {
+    @Override
+    public String description() {
+        return "極端に大きいスライム・マグマキューブを召喚できないようにします。";
+    }
+
+    @EventHandler
+    public void onCreatureSpawn(CreatureSpawnEvent event) {
+        if (!(event.getEntity() instanceof Slime slime)) {
+            return;
+        }
+        if (slime.getSize() <= 30) {
+            return;
+        }
+        event.setCancelled(true);
+        Location location = event.getLocation();
+        Player nearPlayer = getNearestPlayer(location);
+        event.setCancelled(true);
+        if (nearPlayer == null) {
+            return;
+        }
+        nearPlayer.sendMessage(Component.text().append(
+            Component.text("[AntiBigSlime]"),
+            Component.space(),
+            Component.text("負荷対策の為に極端に大きいスライム・マグマキューブの召喚を禁止しています。ご協力をお願いします。", NamedTextColor.GREEN)
+        ));
+        sendAM(Component.text().append(
+            Component.text("["),
+            Component.text("AntiBigSlime", NamedTextColor.RED),
+            Component.text("]"),
+            Component.space(),
+            Component.text(nearPlayer.getName() + "の近くで極端に大きいスライム・マグマキューブが発生しましたが、発生を規制されました。", NamedTextColor.GREEN)
+        ).build());
+    }
+}