diff --git a/src/main/java/io/github/meatwo310/tsukichat/commands/ConfigCommand.java b/src/main/java/io/github/meatwo310/tsukichat/commands/ConfigCommand.java
new file mode 100644
index 0000000..f5d43b0
--- /dev/null
+++ b/src/main/java/io/github/meatwo310/tsukichat/commands/ConfigCommand.java
@@ -0,0 +1,30 @@
+package io.github.meatwo310.tsukichat.commands;
+
+import com.mojang.brigadier.Command;
+import com.mojang.brigadier.context.CommandContext;
+import io.github.meatwo310.tsukichat.config.CommonConfigs;
+import net.minecraft.commands.CommandSourceStack;
+
+public class ConfigCommand {
+    public static int defaultTeamMsg(CommandContext<CommandSourceStack> ctx) {
+        boolean currentValue = CommonConfigs.defaultTeamMsg.get();
+        try {
+            boolean newValue = ctx.getArgument("value", Boolean.class);
+            if (currentValue == newValue) {
+                ctx.getSource().sendSuccess(() -> TsukiChatCommand.getComponent(
+                        "チームメッセージはデフォルトで" + TsukiChatCommand.boolToStr(currentValue) + "のまま変更されませんでした"
+                ), true);
+            } else {
+                CommonConfigs.defaultTeamMsg.set(newValue);
+                ctx.getSource().sendSuccess(() -> TsukiChatCommand.getComponent(
+                        "チームメッセージはデフォルトで" + TsukiChatCommand.boolToStr(newValue) + "に変更されました"
+                ), true);
+            }
+        } catch (IllegalArgumentException e) {
+            ctx.getSource().sendSuccess(() -> TsukiChatCommand.getComponent(
+                    "チームメッセージはデフォルトで" + TsukiChatCommand.boolToStr(currentValue) + "です"
+            ), false);
+        }
+        return Command.SINGLE_SUCCESS;
+    }
+}
diff --git a/src/main/java/io/github/meatwo310/tsukichat/commands/TsukiChatCommand.java b/src/main/java/io/github/meatwo310/tsukichat/commands/TsukiChatCommand.java
index ffafd97..21759b7 100644
--- a/src/main/java/io/github/meatwo310/tsukichat/commands/TsukiChatCommand.java
+++ b/src/main/java/io/github/meatwo310/tsukichat/commands/TsukiChatCommand.java
@@ -29,6 +29,10 @@ public static Component getErrorComponent(String ...message) {
         return Component.literal(PLACEHOLDER + "§c" + String.join("", message));
     }
 
+    public static String boolToStr(boolean value) {
+        return value ? "§a有効§r" : "§c無効§r";
+    }
+
     public static void register(CommandDispatcher<CommandSourceStack> dispatcher) {
         dispatcher.register(Commands.literal("tsukichat")
                 .then(Commands.literal("mode")
@@ -87,6 +91,13 @@ public static void register(CommandDispatcher<CommandSourceStack> dispatcher) {
                         .then(Commands.literal("allow_removing_server_dictionary")
                                 .then(Commands.argument("value", BoolArgumentType.bool())
                                         .executes(PermissionCommand::allowRemovingServerDictionary)))
+                ).then(Commands.literal("config")
+                        .requires(commandSourceStack -> commandSourceStack.hasPermission(2))
+                        .then(Commands.literal("defaultTeamMsg")
+                                .then(Commands.argument("value", BoolArgumentType.bool())
+                                        .executes(ConfigCommand::defaultTeamMsg)
+                                ).executes(ConfigCommand::defaultTeamMsg)
+                        )
                 ).then(Commands.argument("arg", StringArgumentType.string())
                                 .executes((CustomCommand::execute)))
         );