Anodic bonding of silicon to Pyrex glass was studied from the viewpoint of its application to integrated capacitive sensors. Equipment that was developed to allow substrate bonding in atmosphere and in vacuum is described. Vertical and lateral electrical feedthrough structures, which have excellent electrical properties and airtight performance, were developed. The vertical feedthrough structures were applied to capacitive sensors. Other bonding-related problems that were studied, such as wafer distortion, circuit damage, and metalization, are noted.