A clothing treatment device comprising: a housing tub for housing clothing; and a steam supply mechanism for supplying steam to the housing tub, wherein the steam supply mechanism includes: a steam generator having a wall surface which defines a chamber for generating the steam; a heater for heating the wall surface; and a water supply mechanism for supplying water to the chamber, and the steam generator includes: an inlet port into which the water from the water supply mechanism flows through a connection tube; and a discharge port from which the steam evaporated in the chamber moves toward a discharge tube, characterized in that: the supplied water is injected to the wall surface of the chamber of the steam generator by a pump of the water supply mechanism, an evaporation of the water in the chamber is performed on the wall surface heated by the heater; the inlet port and the connection tube are connected to each other by a fixing member, the discharge port and the discharge tube are connected to each other by said fixing member, and the thermal conductivity of a material used for forming the fixing member is lower than a thermal conductivity of a material used for forming the steam generator. a housing tub for housing clothing; and a steam supply mechanism for supplying steam to the housing tub, wherein the steam supply mechanism includes: a steam generator having a wall surface which defines a chamber for generating the steam; a heater for heating the wall surface; and a water supply mechanism for supplying water to the chamber, and the steam generator includes: an inlet port into which the water from the water supply mechanism flows through a connection tube; and a discharge port from which the steam evaporated in the chamber moves toward a discharge tube, characterized in that: the supplied water is injected to the wall surface of the chamber of the steam generator by a pump of the water supply mechanism, an evaporation of the water in the chamber is performed on the wall surface heated by the heater; the inlet port and the connection tube are connected to each other by a fixing member, the discharge port and the discharge tube are connected to each other by said fixing member, and the thermal conductivity of a material used for forming the fixing member is lower than a thermal conductivity of a material used for forming the steam generator. a steam generator having a wall surface which defines a chamber for generating the steam; a heater for heating the wall surface; and a water supply mechanism for supplying water to the chamber, and the steam generator includes: an inlet port into which the water from the water supply mechanism flows through a connection tube; and a discharge port from which the steam evaporated in the chamber moves toward a discharge tube, an inlet port into which the water from the water supply mechanism flows through a connection tube; and a discharge port from which the steam evaporated in the chamber moves toward a discharge tube, characterized in that: the supplied water is injected to the wall surface of the chamber of the steam generator by a pump of the water supply mechanism, an evaporation of the water in the chamber is performed on the wall surface heated by the heater; the inlet port and the connection tube are connected to each other by a fixing member, the discharge port and the discharge tube are connected to each other by said fixing member, and the thermal conductivity of a material used for forming the fixing member is lower than a thermal conductivity of a material used for forming the steam generator. the supplied water is injected to the wall surface of the chamber of the steam generator by a pump of the water supply mechanism, an evaporation of the water in the chamber is performed on the wall surface heated by the heater; the inlet port and the connection tube are connected to each other by a fixing member, the discharge port and the discharge tube are connected to each other by said fixing member, and the thermal conductivity of a material used for forming the fixing member is lower than a thermal conductivity of a material used for forming the steam generator.