Recently rooftop greening has natural elements, for example, tall trees, ponds, meadows increase in commercial facilities. But much natural elements may make visitors unpleasant. The most important thing to commercial facilities is the comfort of visitors, so introduction nature elements effectually to rooftop greening is difficult challenge. In this paper, we research visitor's consciousness of space and natural elements including such wildlife as insects and birds by a questionnaire survey in Namba Parks with various characteristics of natural elements. Main results are as follows. 1) Visitors needed green and flower like elements for convenience such as benches. 2) Visitors are easy to feel nature so that there is much greenery in the field of vision.3) Birds and insects were not almost recognized by visitors and were not regarded as necessary elements.