PURPOSE: To provide an imitation mine device and a signal detector which enables a quantitative record and evaluation of an individual existence of a mechanical contact of mine by a person or car.

CONSTITUTION: A signal showing a mine contact and a signal showing a mine charging position are transmitted from an imitation mine device 1 to a signal detector 2. The signal detector 2 stores these signals together with a discrimination signal, and makes the imitation mine device 1 to generate smoke by a response signal from the signal detector 2, and further stores a signal showing a finish of neutralization process of the imitation mine device 1 together with the signal showing the mine charging position and the discrimination signal.