To provide a method for estimating a support state of an electronic equipment casing, capable of estimating a dynamic support structure of an electronic equipment casing laid in a rest state at practical cost.

In the method for estimating a support state of an electronic equipment casing, vibration for detecting the dynamic support state is given from an exciting device to a casing of electronic equipment provided with the exciting device. The vibration responding characteristic to the given vibration is detected by an acceleration sensor provided in a place different from that of the exciting device, and compared with correlation information between vibration response characteristic and dynamic support state preliminarily stored in the electronic equipment to estimate the support state.