Provided is a toilet seat device configured to automatically control a confirmation test of a leakage current cutting-off function in order to secure the execution of a suitable leakage current cutting-off operation at a leakage current time. A main control unit (10) of a toilet seat device regularly judges whether the toilet seat device is in a using condition or not by using results detected bya sitting sensor (56) or a human body sensor (57). When the main control unit judges that the toilet seat device is not in a using condition, the main control unit makes a relay contact point (21) ina relay mechanism (20) of a leakage current cutting-off unit experimentally open and close by a relay driving unit (12) and makes a relay abnormality detecting unit (14) detect the existence or non-existence of abnormalities. Hence, the minimum necessary degree of confirmation of the leakage current cutting-off function can be carried out at a non-using time of the toilet seat device, so that thetoilet seat device can be used after a normal cutting-off operation of the leakage current cutting-off unit has been confirmed and a suitable leakage current cutting-off operation can be secured.