Biological warfare agents (BWA) such as Bacillus anthracis, Francisella tularensis, Yersinia pestis or butulotoxin represents one of possibilities exploitable by military or terrorists. Rapid detection of BWA is one of the most important prerequisities for successful defense against them. The detection devices mentioned here - biosensors - can be divided acording to their physicochemical transducers to electrochemical, optical and piezoelectric group. A number of publications dealing with biosensors for BWA detection are discussed and special attention is paid to their analytical parameters. The short note is also dedicated to comparison of classical detection methods with biosensors.