To provide a liquid control device capable of accurately monitoring a vaporization process of liquid while maintaining responsiveness in temperature control.

A liquid control device 10 controls spreading and vaporization of a chemical. The liquid control device 10 includes a body 31 having an upper surface 31c supplied with the chemical, a mesh having a minute structure for promoting spreading of the chemical, and a heater 80 for heating the upper surface 31c from inside of the body 31. In the spreading direction of the upper surface 31c, the liquid control device 10 includes: a first temperature sensor 83 for detecting temperature of a first part inside the body 31 between the supplied position and the heater 80; a second temperature sensor 84 for detecting temperature of a second part inside the body 31 on the opposite side of the first part sandwiching the supplied position between the first/second parts; and a controller 70 controlling a heat generation amount of the heater 80 based on the temperature of the first part and executing a predetermined monitoring processing based on the temperature of the second part.