diff --git a/cmd/main.go b/cmd/main.go
index a2953ba..cf3d875 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"database/sql"
 	"fmt"
+	"github.com/azuki-bar/ceviord/pkg/joinVc"
 	"github.com/azuki-bar/ceviord/pkg/slashCmd"
 	"github.com/azuki-bar/ceviord/pkg/speech/grpc"
 	"log"
@@ -73,6 +74,7 @@ func main() {
 	dgSess.AddHandler(func(s *discordgo.Session, _ *discordgo.Connect) { log.Println("connect to discord") })
 	dgSess.AddHandler(ceviord.MessageCreate)
 	dgSess.AddHandler(slashCmd.InteractionHandler)
+	dgSess.AddHandler(joinVc.VoiceStateUpdateHandler)
 	// dgSess.Debug = true
 	gTalker, closer := grpc.NewTalker(&conf.auth.CeviordConn, &conf.param.Parameters[0])
 	defer closer()
diff --git a/pkg/ceviord/handleMsg.go b/pkg/ceviord/handleMsg.go
index ffacd8b..e587110 100644
--- a/pkg/ceviord/handleMsg.go
+++ b/pkg/ceviord/handleMsg.go
@@ -227,6 +227,12 @@ func MessageCreate(sess *discordgo.Session, msg *discordgo.MessageCreate) {
 
 func RawSpeak(text string, guildId string, sess *discordgo.Session) error {
 	cev, err := Cache.Channels.GetChannel(guildId)
+	if cev == nil {
+		return fmt.Errorf("get channel failed")
+	}
+	if err != nil {
+		return err
+	}
 	isJoined, err := cev.IsActorJoined(sess)
 	if err != nil || !isJoined {
 		return err
@@ -272,6 +278,9 @@ func SendMsg(msg string, session *discordgo.Session, guildId string) error {
 
 func SendEmbedMsg(embed *discordgo.MessageEmbed, session *discordgo.Session, guildId string) error {
 	cev, err := Cache.Channels.GetChannel(guildId)
+	if cev == nil {
+		return err
+	}
 	isJoined, err := cev.IsActorJoined(session)
 	if err != nil || !isJoined {
 		return err
diff --git a/pkg/dgvoice/dgvoice.go b/pkg/dgvoice/dgvoice.go
index c13eab6..94c20e8 100644
--- a/pkg/dgvoice/dgvoice.go
+++ b/pkg/dgvoice/dgvoice.go
@@ -47,9 +47,9 @@ var OnError = func(str string, err error) {
 	prefix := "dgVoice: " + str
 
 	if err != nil {
-		os.Stderr.WriteString(prefix + ": " + err.Error())
+		os.Stderr.WriteString(prefix + ": " + err.Error() + "\n")
 	} else {
-		os.Stderr.WriteString(prefix)
+		os.Stderr.WriteString(prefix + "\n")
 	}
 }
 
diff --git a/pkg/discord/user.go b/pkg/discord/user.go
new file mode 100644
index 0000000..3e0dbd7
--- /dev/null
+++ b/pkg/discord/user.go
@@ -0,0 +1,33 @@
+package discord
+
+import "github.com/bwmarrin/discordgo"
+
+type User struct {
+	*discordgo.User
+	sess    *discordgo.Session
+	guildId string
+}
+
+func NewUser(userId string, s *discordgo.Session, guildId string) (User, error) {
+	u, err := s.User(userId)
+	if err != nil {
+		return User{}, err
+	}
+	return User{
+		User:    u,
+		sess:    s,
+		guildId: guildId,
+	}, nil
+}
+
+// ScreenName returns NickName if defined, and returns Username in else.
+func (u User) ScreenName() (string, error) {
+	m, err := u.sess.GuildMember(u.guildId, u.ID)
+	if err != nil {
+		return "", err
+	}
+	if m.Nick != "" {
+		return m.Nick, nil
+	}
+	return u.Username, nil
+}
diff --git a/pkg/joinVc/handler.go b/pkg/joinVc/handler.go
new file mode 100644
index 0000000..3699dbf
--- /dev/null
+++ b/pkg/joinVc/handler.go
@@ -0,0 +1,123 @@
+package joinVc
+
+import (
+	"fmt"
+	"github.com/azuki-bar/ceviord/pkg/ceviord"
+	"github.com/azuki-bar/ceviord/pkg/discord"
+	"github.com/azuki-bar/ceviord/pkg/logging"
+	"github.com/bwmarrin/discordgo"
+)
+
+type handler struct {
+	*discordgo.VoiceStateUpdate
+	session        *discordgo.Session
+	changeState    ChangeRoomState
+	user           discord.User
+	joinedChannels ceviord.Channels
+}
+
+type Handler interface {
+	handle(speaker func(text, guildId string, session *discordgo.Session) error) error
+}
+
+func (h *handler) handle(speaker func(text string, guildId string, session *discordgo.Session) error) error {
+	switch h.changeState.(type) {
+	case intoRoom, outRoom:
+		return speaker(h.changeState.GetText(), h.VoiceStateUpdate.GuildID, h.session)
+	default:
+		return nil
+	}
+}
+
+type ChangeRoomState interface {
+	GetText() string
+}
+
+func NewChangeRoomState(vsu *discordgo.VoiceStateUpdate, s *discordgo.Session, cs *ceviord.Channels) ChangeRoomState {
+	if !cs.IsExistChannel(vsu.GuildID) {
+		return outOfScope{}
+	}
+	c, err := cs.GetChannel(vsu.GuildID)
+	if err != nil {
+		return outOfScope{}
+	}
+	u, err := discord.NewUser(vsu.UserID, s, vsu.GuildID)
+	if u.Bot {
+		return outOfScope{}
+	}
+	if err != nil {
+		ceviord.Logger.Log(logging.WARN, err)
+		return outOfScope{}
+	}
+	scn, err := u.ScreenName()
+	if err != nil {
+		ceviord.Logger.Log(logging.WARN, err)
+		return outOfScope{}
+	}
+	var state ChangeRoomState = outOfScope{}
+	if (vsu.BeforeUpdate == nil || vsu.BeforeUpdate.ChannelID != c.VoiceConn.ChannelID) && vsu.VoiceState != nil {
+		state = intoRoom{screenName: scn}
+	} else if vsu.BeforeUpdate != nil && vsu.VoiceState.ChannelID != c.VoiceConn.ChannelID {
+		state = outRoom{screenName: scn}
+	}
+	switch state.(type) {
+	case intoRoom:
+		if vsu.ChannelID == c.VoiceConn.ChannelID {
+			return state
+		}
+	case outRoom:
+		if vsu.BeforeUpdate.ChannelID == c.VoiceConn.ChannelID {
+			return state
+		}
+	default:
+		return outOfScope{}
+	}
+	return outOfScope{}
+}
+
+type intoRoom struct{ screenName string }
+
+func (r intoRoom) GetText() string {
+	return fmt.Sprintf("%sさんが入室しました。", r.screenName)
+}
+
+type outRoom struct{ screenName string }
+
+func (r outRoom) GetText() string {
+	return fmt.Sprintf("%sさんが退室しました。", r.screenName)
+}
+
+type outOfScope struct{ ChangeRoomState }
+
+func NewHandler(s *discordgo.Session, vsu *discordgo.VoiceStateUpdate) (Handler, error) {
+	u, err := discord.NewUser(vsu.UserID, s, vsu.GuildID)
+	if err != nil {
+		return nil, err
+	}
+	cs := NewChangeRoomState(vsu, s, &ceviord.Cache.Channels)
+	if cs == nil {
+		// ignore not covered event
+		return nil, nil
+	}
+	return &handler{
+		session:          s,
+		VoiceStateUpdate: vsu,
+		user:             u,
+		changeState:      cs,
+		joinedChannels:   ceviord.Cache.Channels,
+	}, nil
+}
+
+func VoiceStateUpdateHandler(s *discordgo.Session, vsu *discordgo.VoiceStateUpdate) {
+	h, err := NewHandler(s, vsu)
+	if err != nil {
+		ceviord.Logger.Log(logging.WARN, err)
+		return
+	}
+	err = h.handle(ceviord.RawSpeak)
+	if err != nil {
+		ceviord.Logger.Log(logging.WARN, err)
+		return
+	}
+	return
+}