SEAT STATE SENSING DEVICE, COMPUTER-READABLE RECORDING MEDIUM RECORDING A PROGRAM, AND SEAT STATE SENSING METHOD

A seat state sensing device includes a first vibration detector that is installed in a seat of a vehicle, detects vibration, and outputs a first vibration signal, a second vibration detector that is installed in a vehicle body near the seat, detects vibration, and outputs a second vibration signal, a first calculation unit that calculates a similarity between the first vibration signal input from the first vibration detector and the second vibration signal input from the second vibration detector, and a sensing unit that senses a seat state including at least one of a slide position of the seat in a front-rear direction of the vehicle body, a reclining angle of the seat, and an orientation of the seat with respect to the front-rear direction of the vehicle body, based on the similarity calculated by the first calculation unit.