PURPOSE: To drastically reduce the cost and time for the maintenance inspection and improve the safety in work, by detecting the operation resistance in a used state from a remote place and detecting a mechanical vibrationproof device which shows an abnormal operation resistance, in an early stage.

CONSTITUTION: As for a mechanical vibrationproof device 10 whose one end is connected with a vibration part 1 and the other end is connected with a fixed part 2, a load column 12 having an ear part 13a connected with the vibration part 1 and a ball nut 13b installed in a shiftable manner in the axis line direction. Further, the device 10 is equipped with a ball screw 14 which is screwed with the ball nut 13b and converts the rectilinear movement of the ball nut to the revolution movement, brake device 16 which applies brake on the revolution according to the revolution speed of the ball screw, case part 18 equipped with a brake device built in and connected with the fixed part 2, load sensor 20 for detecting the load acting in the axis line direction, and a data processing device 22 which judges the soundness from the detected load.