A faucet apparatus configured to spout and shut off hot and cold water with an adjusted temperature and flow rate, the faucet apparatus comprising: a hot water passage configured that hot water is supplied from a hot water supply source; a cold water passage configured that cold water is supplied from a cold water supply source; a faucet main body configured to mix the hot water and the cold water that are supplied respectively from the hot water passage and the cold water passage; a spouting portion configured to spout hot and cold water mixed in the faucet main body; an on-off valve (12, 14) configured to open and close a flow passage at an upstream side of the spouting portion; a rotating operation unit provided rotatably to the faucet main body, the rotating operation unit being configured to be capable of a water spouting and shutting off operation that switches the spouting portion to a water spouting state or a water shutting off state by performing an on/off operation of the on-off valve (12, 14) by performing a rotating operation, and the rotating operation unit being configured to be capable of a flow adjustment operation and a temperature adjustment operation of hot and cold water spouted from the spouting portion in the water spouting state; an acceleration sensor provided in the rotating operation unit, the acceleration sensor being configured to rotate with the rotating operation unit in response to the rotating operation of the rotating operation unit so as to detect an attitude and a rotating movement of the rotating operation unit; and a control unit configured to control on and off of the on-off valve (12, 14) based on detection information of the acceleration sensor, wherein the rotating operation unit includes a lever member extending from a proximal end that is provided rotatably at the faucet main body to a distal end, and the rotating operation unit is configured to move without striding across a horizontal plane when a rotating operation is performed from a first operation position (Q1,T1) to a second operation position (Q2,T2) around a predetermined rotation axis (A1,A2) of the rotating operation unit in the water spouting state, characterised in that the acceleration sensor is provided at a proximal end side from an intermediate portion between the proximal end and the distal end of the lever member, and configured such that a rotation axis of the acceleration sensor at a time of rotating within a predetermined plane in response to the flow adjustment operation and temperature adjustment operation of the hot and cold water does not coincide with a gravity direction axis, so that rotation within the horizontal plane is avoided in the water spouting state. a hot water passage configured that hot water is supplied from a hot water supply source; a cold water passage configured that cold water is supplied from a cold water supply source; a faucet main body configured to mix the hot water and the cold water that are supplied respectively from the hot water passage and the cold water passage; a spouting portion configured to spout hot and cold water mixed in the faucet main body; an on-off valve (12, 14) configured to open and close a flow passage at an upstream side of the spouting portion; a rotating operation unit provided rotatably to the faucet main body, the rotating operation unit being configured to be capable of a water spouting and shutting off operation that switches the spouting portion to a water spouting state or a water shutting off state by performing an on/off operation of the on-off valve (12, 14) by performing a rotating operation, and the rotating operation unit being configured to be capable of a flow adjustment operation and a temperature adjustment operation of hot and cold water spouted from the spouting portion in the water spouting state; an acceleration sensor provided in the rotating operation unit, the acceleration sensor being configured to rotate with the rotating operation unit in response to the rotating operation of the rotating operation unit so as to detect an attitude and a rotating movement of the rotating operation unit; and a control unit configured to control on and off of the on-off valve (12, 14) based on detection information of the acceleration sensor, wherein the rotating operation unit includes a lever member extending from a proximal end that is provided rotatably at the faucet main body to a distal end, and the rotating operation unit is configured to move without striding across a horizontal plane when a rotating operation is performed from a first operation position (Q1,T1) to a second operation position (Q2,T2) around a predetermined rotation axis (A1,A2) of the rotating operation unit in the water spouting state, characterised in that the acceleration sensor is provided at a proximal end side from an intermediate portion between the proximal end and the distal end of the lever member, and configured such that a rotation axis of the acceleration sensor at a time of rotating within a predetermined plane in response to the flow adjustment operation and temperature adjustment operation of the hot and cold water does not coincide with a gravity direction axis, so that rotation within the horizontal plane is avoided in the water spouting state.