To provide a functional liquid filling device capable of accurately filling the flow channel in a functional liquid droplet discharge head with a functional liquid by directly bringing the detector of a detection means into contact with the functional liquid, and a liquid droplet discharge device equipped with it.

The functional liquid filling device is equipped with a liquid feeding means for feeding the functional liquid to a functional liquid tank 231 toward the head cap 102 joined to the functional liquid droplet discharge head 31 through the functional liquid droplet discharge head 31 connected to the functional liquid tank 231, a detection means 161 for detecting that the passed functional liquid reaches the head cap 102 and a control means 6 for stopping the driving of the liquid feeding means on the basis of the detection result of the detection means 161. The detection means 161 has the quartz oscillator 301 arranged in the head cap 102 and/or a waste liquid pipeline 252 and a detector 303 for detecting the presence/absence of the functional liquid on the basis of a change in the resonance frequency of the quartz oscillator 301.