This study aims to describe the implementation of project-based learning in Vocational High School (VHS) of Mechanical Engineering Expertise Competency in terms of planning, implementation, evaluation, and constraints. The study was carried out using qualitative descriptive methods. Research respondents were vocational teachers in the Mechanical Engineering Expertise Competency of the State VHS of Technology and Engineering in Malang City. The research data was collected using in-depth interview techniques, observation, and analysis of learning documents which were then analyzed qualitatively. The results show that vocational teachers have implemented PjBL both in terms of planning, implementation, and evaluation of learning. In projects planning the teachers have not involved the industries, the projects are relatively simple, so products of project cannot be utilized and not sold. The syntax of PjBL has not been seen in the implementation plan of learning but the implementation of practical learning at the workshop/laboratotium conducted by the teachers indicates the implementation of the PjBL syntax. Evaluation of learning outcomes in PjBL includes evaluation of processes and products. The main obstacle faced by teachers lies in determining the project, the preparation of the PjBL syntax, the limited practicum facilities in the school workshop/laboratorium, and the limited time for practicum.