Slippage detection device and method

A slippage detection device, characterized by comprising:

• a slippage detection member that includes a pressure-sensitive conductive sheet provided on a contact receiving member that receives contact with a contact member;
• a slippage detection signal formation circuit that forms a slippage detection signal containing a high-frequency waveform component that occurs right before the occurrence of slippage displacement of the contact member on the basis of a change in resistivity of the pressure-sensitive conductive sheet in response to a detection signal transmitted from the pressure-sensitive conductive sheet at a time when the contact member is pushed against the contact receiving member via the pressure-sensitive conductive sheet;
• and
• a slippage detection calculation section that transmits a slippage confirmation signal indicating the occurrence of initial slippage right before the occurrence of the slippage displacement at a time when a high-frequency waveform component generated right before the occurrence of the slippage displacement exceeds a predetermined threshold value.