Provided is a faucet device for an aircraft lavatory unit, wherein that achieves weight reduction, that saves space, and that minimizes maintenance costs. A second joint (50B) and a third joint (50C) are joined by inserting the third joint (50C) of a heater module (40) into a second joint (50B) of a valve module (38), and screw members (66) are used to fasten a first case (54A) and a second case (54B). As a result, the valve module (38) and the heater module (40) are joined in series via the second joint (50B) and the third joint (50C). A first connector (52A) of a controller module (42) is joined to a third connector (52C) of the valve module (38) and a second connector (52B) of the controller module (42) is joined to a fourth connector (52D) of the heater module (40). The first joint (50A) of the valve module (38) is joined to a water supply pipe (46). A fourth joint (50D) of the heater module (40) and a faucet main body (24) are joined via a pipe (64).