This paper describes the standardization of the evaluation scale to measure psychosocial impacts of assistive products. J-PIADS (Japanese Psychosocial Impact of Assistive Devices Scale) was formulated with translation of an English version of the PIADS developed by Jutai et al. This scale is composed of 26 items: competence subscale, adaptability subscale and self-esteem subscale. The test-retest investigation and the internal consistency tests that were conducted on the users of eye glasses, contact lenses, wheelchairs and prostheses proves the scale to be reliable enough. Setting the obvious base line was effective on the good reliability. In addition, the inspections that were conducted on the users of eye glasses, contact lenses and dysphemia reducing products support validation of the J-PIADS.