NOVELTY - The coater has a die portion (100) comprising internal space (111) for accommodating the electrode slurry. The supply opening (113) is used for supplying the electrode slurry to the internal space. The die portion is provided with a vent (115) for ejecting the electrode slurry from the internal space to the metal substrate. The metal substrate is coated with slurry. The heating unit (130) is provided inside the die portion, so as to make the temperature of die portion constant to the prescribed temperature.    USE - Slot die coater for producing electrode of secondary battery used in cellular phone, notebook computer and electric vehicle.    ADVANTAGE - The heating unit is provided inside the die portion, so as to make the temperature of die portion constant to the prescribed temperature, so that the temperature of each portion of slot die coater is identical. The emission quantity of the electrode slurry in the width direction is constant. The quality of the electrode is improved. The heating unit is heated using the electrical coil, so that the temperature of slot die coater can be controlled precisely. The heating unit operates with the temperature measurement sensor and the die portion is heated up, so that the temperature of slot die coater is controlled precisely. The heating unit is extended in the direction parallel to the width direction of die portion, so that the temperature of slot die coater is controlled effectively. The cylindrical shaped or pipe shaped central axis of the heating pipe is arranged along the width direction of main portion, so that calorie can be radiated uniformly from the heating unit. The heat can be easily delivered from the heating unit to the slot die coater and the temperature of the slot die coater can be controlled effectively. The slot die coater can produce the electrode of the most preferable form.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the slot die coater.    Die portion (100)    Internal space (111)    Supply opening (113)    Vent (115)    Heating unit (130)