The purpose of this paper is to clarify the present state of employment of mentally-disabled persons for building cleaning work and disincentives of the employment by the questionnaire survey to the building maintenance companies. Thousand seven valid answers were gotten. They are classified into 4 groups. Group1 is companies that have never employed mentally-disabled person for these 10 years. Group2 is companies that have employed them for these 10 years, but now not. Group3 is companies that employ them now. Group4 is companies that employ more than 3 mentally-disabled persons now. The questionnaire answer data relating to the present state and disincentives of the employment are analyzed according to this classification. The problems concerning the employment of mentally-disabled persons for building cleaning work could be grasped.