In the thesis, the author deals with the issue of detecting causes of vehicle fires. The first part includes theoretical characterizations of tasks and procedures of the inquirer of causes of vehicle fires in carrying out this activity under the applicable regulations in the Slovak republic. The second part of the thesis practically focuses on solved cases of vehicle fires, which were divided into two groups: fires caused by operational-technical failure and fires caused intentionally. It compares these two types of fires and looks for differences in traces of fire and characterizes the evidence that identified the cause of its occurrence.