This paper analyzes psychological effects of pictures of indoor greenery in a simulated office space. Indoor greenery is expected to mitigate stress of occupants in an office space mainly due to the visual effect. Inquiry sheets are composed of pictures of a simulated office room with greenery and some questions asking their impressions. 17 types of pictures are prepared for the inquiries. Greenery volumes are modified in 16 different types, including the control condition without a plant. As a result, the most favorite picture is elected when the greenery volume is in the middle ratio for the dynamic visual field among 17 types of pictures.