With the development and widespread use of wearable devices and smartphones, digital biomarkers that use biometric information obtained from these devices to objectively determine the presence or absence of disease and the effectiveness of treatment have been attracting attention. Voice biomarkers can be considered a type of digital biomarker and are garnering interest because voice input is extensively used, making it easier to acquire voice data. Further, significant improvement in computer technology has allowed the analysis of voice data using various devices. In addition, the COVID-19 pandemic has changed lifestyles, and living in remote environments has become more prevalent, increasing the need for such technologies (Alexa 2020). Digital biomarkers can capture information noninvasively and allow for remote intervention. In particular, voice which does not require special sensors and has a wide range of applications can be an excellent biomarker.