This paper analyzes and verifies the size of working areas around sickbeds based on two simulations of medical/nursing activities and the questionnaires on the size of service clearance around sickbeds. The questionnairing was conducted on 35 medical and nursing staffs in active service. The first experiment was done on a portable X-ray camera while it was shooting patients in different poses on a bed. The second experiment simulated the whole process of medical and nursing operations on three types of patients with advanced diseases. The operations were played realistically by using all real things including medical and nursing staffs in active service. The experiment programs and operations were put in a script in advance and the experiment was performed in accordance with the script. The whole process of the simulation was filmed with video cameras and image data was read into a computer to perform related analyses. Through the experiment, the medical and nursing staffs might have felt that the sizes of their service clearances were too narrow. The questionnairing conducted on them was to check their desires for increments on the sizes of their service clearances around sickbeds in the departments they belong to. The movement loci of the portable X-ray camera during operation were drawn, and based on the envelope lines of the locus areas, the degree of influence on the size of service clearance around sickbeds was checked. The analysis based on the simulation over the whole process of medical/nursing operations on patients explains the size of required service clearance. The analysis was performed by classifying different combinations of operators and equipment at a certain time in an area section (time section) and finding the maximum combination value from the classified results. The result has proved that the floor size of service clearance around sickbeds is 3.6m x 5.1m.