The reason why there are many kinds of handle shapes for the single handle faucets is because there are no design guidelines for their usability. This study is on making a design guideline for the new single handle faucet which is now developing at TAKAGI CO., LTD. in Japan. First, a questionnaire survey on the usability of 10 basic handle shapes was developed. We made the test subjects evaluate those handle’s usability in 5 levels, and compared them to find out which component improves their usability. Secondly, 4 advanced handle shapes were developed using the results of the basic shape questionnaire survey. We made the test subjects evaluate those handle’s usability in 5 levels and by the image words we selected which may have a connection between the handle’s appearance. Furthermore, we used the principle component analysis to find out which image word has a strong mutual relation between the appearance of the handle and their usability. Consequently, we were able to find out the component which will improve the handle’s usability, and the image words which may have a strong mutual relationship between the appearance of the handle and their usability.