The diploma thesis examines the role of convention in J. L. Austin's speech act theory. It describes the possibility of "how to do things with words": such an analysis of language will be suggested that does not focus on the category of truth when dealing with particular utterances but rather replaces it with the category of felicity of a speech act in the social context. After having offered the explication including the central points of the given theory, there starts the investigation of which parts of the speech act theory are conventionally based and what role do conventions play in the speech act theory as a whole
