Safety device against combustible gas leaks for household appliances

A safety device against gas leaks for an apparatus having at least one gas tap or the like (1) includes control means (11), safety means (22) and detection means (12, 53), for detecting possible presence of gas in a surrounding environment. The detection means (12, 53) are in signal communication with the control means (11), which are configured for controlling the safety means (22) in function of detections earned out by the detection means (12, 53), in order to prevent or interrupt the inflow of combustible gas to a burner. The control means (11) and the safety means (22) belong to a first functional unit (A) of the device (A, B), which is coupled or configured for the coupling with a portion of the body (2) of the tap (1). Preferably the safety means (22) are controllable by the control means (11) for interrupting electric power supply to a solenoid of the tap, following a command signal generated by the detection means (12, 53) and causing as a consequence the passage of the valve in the respective closed condition.