Abstract
Machine miniaturization is remarkable due to recent development of mechanical technology．The influence of capillary force by wet environment is dominant in small machines． For this reason, the influence of the wet phenomenon cannot be ignored in designing of small machines． Therefore, it is important to evaluate the capillary force under humid environment． The capillary force is closely related to the meniscus shape．In this research, in order to record the force under wet environment and the meniscus shape, firstly we developed a device which can precisely observe the wet shape and measure the surface force simultaneously． Subsequently, we report on the relationship between the surface force and the meniscus shape.
