The emergence of the COVID-19 pandemic at the end of 2019 made changes in almost all life sectors. The uncontrolled spread of the virus has caused fear in society to visit doctors, hospitals, and other health facilities. This condition makes the presence of the Halodoc mobile application, which provides online consultation services, be an answer to the public's anxiety to keep getting services from medical personnel without having to meet face to face. Technology Acceptance Model (TAM) is one model to analyse the factors that influence the acceptance of new technology. This research aims to analyse the relationship between variables that affect Use Behavior related to the adoption of Telehealth Halodoc services in the Jabodetabek society. This research uses a quantitative approach with the causality research method. It is a research design to examine the causal relationship between variables. In this research, there is a moderator variable, namely Task Technology Fit. The data used in this research is data obtained from a questionnaire containing questions related to the variables used in the research using the proportional stratified random sampling technique. The results showed that all independent variables: Performance Expectancy, Social Influence, Ease of Use, and Task Technology Fit had a positive and significant effect on Use Behavior. However, the moderator variable Task Technology Fit weakens Performance Expectancy and Social Influence on some respondents. The results follow the theory that new technology can be accepted if it follows user needs, is easy to use, and has practical value for completing a job. However, it should still be necessary to develop and add application features and improve application design to make it more user-friendly

Keywords : Technology Acceptance Model, Teleheath, Halodoc, Use Behavior, Task Technology Fit.