FLUID HEATER

Disclosed in an embodiment is a fluid heater including a main body including a partitioning part having a plate shape and a flow passage forming part forming a flow passage on the other surface of the partitioning part, a heating plate disposed on the flow passage forming part and having a plate shape and including a heating pattern having a shape corresponding to the flow passage, a circuit board disposed on one surface of the partitioning part and configured to control the heating pattern to generate heat, and a bus bar electrically connecting the heating pattern and the circuit board, wherein the flow passage forming part includes a turning vane disposed in a curved flow passage of the flow passage.