A mixing faucet using a low cost temperature sensing spring. A mixing faucet (1) includes a casing (2)having a hot water inlet opening (24), a cold water inlet opening (23), and an outlet opening (28); a control valve element (3) slidably mounted in the casing (2) and capable of being switched to any one of a cold water discharge state, a mixed water discharge state, and a hot water discharge state; a temperature adjusting screw (7) rotatably placed at one end in the casing (2); a slider (6) sliding in the casing (2) in association with rotation of the temperature adjusting screw (7); a bias spring (5) placed in the casing (2), between the control valve element (3) and the slider (6), and biasing the control valve element (3) to the water inlet opening (23) side; a temperature sensing spring (4) for biasing, in the casing (2), the control valve element (3) to the hot water inlet opening (24) side and whose elastic force changes according to a change in the temperature of hot water flowing in the casing (2); and a pull-up spring (10) for biasing the control valve element (3) to the hot water inlet opening (24) side in the cold water discharge state and in the mixed water discharge state.