The article concerns the issue of the concept of an accident at work of a Deputy and Senator in the light of the applicable social insurance regulations and the act on the exercise of the mandate of a Deputy or Senator. This issue has been presented in a broader context, taking into account the legal analysis in terms of the definition of an employee accident at work. The differences between an employee accident at work and a non-employee one were discussed in detail. A significant part of the article is devoted to the scope of activities covered by the concept of an accident of a Deputy and Senator.