As a result of the recent spread of computer technology and rapid growth of the Internet, we now live in an age when all kinds of information can be exchanged and processed at any time and in any place, including information of a highly confidential nature. Accordingly, we conducted experiments on designing secure spaces in public work environments where users can handle personal information with reassurance. The first experiment considers the effects of partition size ("height" and "depth") on user reassurance. The second experiment assesses how the safe separation distance was affected by the type of personal information and the presence or absence of a partition that was sufficiently high to conceal the screen. We show how these factors impact the user's sense of security in handling sensitive information.