A toilet device is provided and includes a toilet seat, a main part, and an electric opening/closing mechanism; the toilet seat includes a toilet seat main body, and a hinge part provided at a rear center of the toilet seat main body; the toilet seat is rotatable by being pivotally supported by the main part at two sides of the hinge part; the electric opening/closing mechanism performs an electric opening/closing of the toilet seat and is provided in the main part; the electric opening/closing mechanism includes a motor and a transmission mechanism; the motor is disposed to have a rotation axis offset from a rotation axis of the hinge part; and the transmission mechanism connects the motor and one end of the hinge part and transfers a drive force of the motor to the hinge part.