A faucet device (30A-F) for an aircraft lavatory unit, comprising: a faucet main body; a water supply pipe; a water supply channel that connects the water supply pipe and the faucet main body; a water supply valve disposed in the water supply channel; heating means for heating water supplied from the water supply channel; and control means for performing control of an opening and closing operation of the water supply valve and a heating operation of the heating means, the faucet device (30A-F) for the aircraft lavatory unit further comprising: a valve module and a heater module that are disposed in series in a section of the water supply channel, the valve module including a first case, a first joint that is provided in a surface of the first case and is removably joined to the water supply channel, a second joint (50B, 70) that is provided in the surface of the first case at a different location from that of the first joint, and the water supply valve that is integrated in the first case and connects the first joint and the second joint (50B, 70), and the heater module including a second case, a third joint (50C, 72) that is provided in a surface of the second case and is removably joined to the second joint (50B, 70), a fourth joint that is provided in the surface of the second case at a different location from that of the third joint (50C, 72) and removably joined to the water supply channel, a water channel for heating that is integrated in the second case and connects the third joint (50C, 72) and the fourth joint, and the heating means that is integrated in the second case and heats water flowing in the water channel for heating, wherein the faucet device (30A-F) further comprises a holding means (66, 55A, 55B, 74) for holding connection between the first case and the second case. a faucet main body; a water supply pipe; a water supply channel that connects the water supply pipe and the faucet main body; a water supply valve disposed in the water supply channel; heating means for heating water supplied from the water supply channel; and control means for performing control of an opening and closing operation of the water supply valve and a heating operation of the heating means, the faucet device (30A-F) for the aircraft lavatory unit further comprising: a valve module and a heater module that are disposed in series in a section of the water supply channel, the valve module including a first case, a first joint that is provided in a surface of the first case and is removably joined to the water supply channel, a second joint (50B, 70) that is provided in the surface of the first case at a different location from that of the first joint, and the water supply valve that is integrated in the first case and connects the first joint and the second joint (50B, 70), and the heater module including a second case, a third joint (50C, 72) that is provided in a surface of the second case and is removably joined to the second joint (50B, 70), a fourth joint that is provided in the surface of the second case at a different location from that of the third joint (50C, 72) and removably joined to the water supply channel, a water channel for heating that is integrated in the second case and connects the third joint (50C, 72) and the fourth joint, and the heating means that is integrated in the second case and heats water flowing in the water channel for heating, wherein the faucet device (30A-F) further comprises a holding means (66, 55A, 55B, 74) for holding connection between the first case and the second case. a valve module and a heater module that are disposed in series in a section of the water supply channel, the valve module including a first case, a first joint that is provided in a surface of the first case and is removably joined to the water supply channel, a second joint (50B, 70) that is provided in the surface of the first case at a different location from that of the first joint, and the water supply valve that is integrated in the first case and connects the first joint and the second joint (50B, 70), and the heater module including a second case, a third joint (50C, 72) that is provided in a surface of the second case and is removably joined to the second joint (50B, 70), a fourth joint that is provided in the surface of the second case at a different location from that of the third joint (50C, 72) and removably joined to the water supply channel, a water channel for heating that is integrated in the second case and connects the third joint (50C, 72) and the fourth joint, and the heating means that is integrated in the second case and heats water flowing in the water channel for heating, wherein the faucet device (30A-F) further comprises a holding means (66, 55A, 55B, 74) for holding connection between the first case and the second case.