To provide a liquid pump device which has a function of determining whether or not an inside of a housing of a pump is filled with a liquid at powering-on.
This liquid pump device 1 comprises: a liquid pump device body part 5; and a control mechanism 6. The liquid pump device body part 5 includes: the housing 20; a liquid pump part 2 having a rotor 21 rotating inside the housing; a rotation torque generation part 3 provided with a rotation part 31 having a magnet 33 which attracts the rotor 21; an electromagnet 41 which attracts the rotor; and a position control part 4 having a position sensor 42 for detecting a position of the rotor. In the liquid pump device body part 5, the rotor 21 is rotated in a state in which the rotor is not in contact with the housing. The control mechanism 6 is provided with the function of determining a state in which the housing is not filled with the liquid. The determining function determines the state in which the housing is not filled with the liquid, using a rotor moving function for determination which moves the rotor in the housing using the electromagnet, a moving time calculating function of the rotor, a moving time threshold memory part, a moving time calculation value, and a threshold value.
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