diff --git a/BassyBot.pm b/BassyBot.pm
index 59db715..18ccdf8 100644
--- a/BassyBot.pm
+++ b/BassyBot.pm
@@ -7,15 +7,27 @@ use utf8;
 use Moose;
 extends 'TwitterBot';
 use Time::ParseDate;
+use Log::Log4perl;
 
 $BassyBot::VERSION = '0.2';
 
+has 'logger' => (
+	isa => 'Log::Log4perl::Logger',
+	is => 'ro',
+	lazy => 1,
+	builder => '_build_logger',
+);
+
+sub _build_logger {
+	return Log::Log4perl->get_logger(__PACKAGE__);
+}
+
 my @ACTIONS = (
   # print out message
   sub {
     my $self = shift;
     my $tweet = shift;
-    print "Searching reaction for ", &_format_tweet($tweet), "\n";
+    $self->logger->info("Searching reaction for ". &_format_tweet($tweet));
     return ();
   },
   # ignore myself
@@ -97,6 +109,8 @@ sub BUILD {
 		my $self = shift;
 		$self->util->tweet("一人で焼肉食いにいってくる。18000円だけどな！");
 	});
+
+	$self->logger->info("bassy-bot initialized.");
 }
 
 sub _build_actions {
@@ -117,6 +131,12 @@ sub _format_tweet {
   return "$ago ago: $tweet->{id} <$tweet->{user}{screen_name}/$tweet->{user}{id}> $tweet->{text}";
 }
 
+sub tweet {
+	my $self = shift;
+	$self->logger->info("> $_[0]".($_[1] ? " in_reply_to_status_id => $_[1]" : ""));
+	$self->util->tweet(@_);
+}
+
 no Moose;
 __PACKAGE__->meta->make_immutable();
 
diff --git a/TwitterUtil.pm b/TwitterUtil.pm
index 4c8a324..dad3b3c 100644
--- a/TwitterUtil.pm
+++ b/TwitterUtil.pm
@@ -78,9 +78,6 @@ sub tweet {
   my $message = shift;
   my $in_reply_to_status_id = shift;
   my %new_status = (status => $message);
-  print "> $message";
-  print " in_reply_to_status_id => $in_reply_to_status_id" if $in_reply_to_status_id;
-  print "\n";
   $new_status{in_reply_to_status_id} = $in_reply_to_status_id if $in_reply_to_status_id;
   $self->twitter->update(\%new_status);
 }
diff --git a/bassy-bot b/bassy-bot
index 00518fa..3029949 100644
--- a/bassy-bot
+++ b/bassy-bot
@@ -4,6 +4,7 @@ use strict;
 use warnings;
 
 use Getopt::Long;
+use Log::Log4perl;
 use BassyBot;
 
 my $username = 'bassytime';
@@ -22,6 +23,8 @@ die "--pass='YourPassword' plz.\n" unless $password;
 
 binmode STDOUT, ':encoding(shiftjis)' if $sjis; 
 
+Log::Log4perl->init("bassy-bot-logger.conf");
+
 BassyBot->new(username => $username, password => $password, ssl => ! $nossl)->start;
 
 
diff --git a/bassy-bot-logger.conf b/bassy-bot-logger.conf
new file mode 100644
index 0000000..7b9afb5
--- /dev/null
+++ b/bassy-bot-logger.conf
@@ -0,0 +1,5 @@
+log4perl.rootLogger=TRACE, CONSOLE
+
+log4perl.appender.CONSOLE=Log::Log4perl::Appender::ScreenColoredLevels
+log4perl.appender.CONSOLE.layout=PatternLayout
+log4perl.appender.CONSOLE.layout.ConversionPattern=[%r] %F %L %c - %m%n