Sending multiple email(to) using laravel mailable

I am using laravel 5.6 and trying to send email to multiple email address. Here my code works for only one email. How can I use multiple email? I am using mailable

Here is my controller

public function sendEmail(Request $request)
    {
      Mail::send(new sendMail());
      Session::flash('conf_email', 'ok');
      return redirect('/send-email');
    }

class SendMail extends Mailable

public function build(Request $request)
{
    return $this->view('mail',['msg'=>$request->message])->to($request->to);
}

via Chebli Mohamed