A steam generator comprising: a generator body including an introduction part through which fluid is introduced and a discharge part through which the fluid is discharged; a first flow channel defining a flowing path for fluid, which is introduced into the generator body through the introduction part; a second flow channel connected to the first flow channel to guide fluid toward the discharge part; a third flow channel for allowing the second flow channel to communicate with the discharge part; and a heating part for heating the generator body to supply heat to fluid in the respective flow channels (75, 76, 77), the heating part comprising: a first heating part connected to a positive electrode of a power source to supply heat to fluid in the second flow channel; a second heating part connected to a negative electrode of the power source and spaced apart from the first heating part by a predetermined distance to supply heat to fluid in the second flow channel; and a third heating part connecting the first and second heating parts to supply heat from at least partial area thereof to fluid in the first flow channel, characterized in that the first heating part includes: a first heating body extending toward the second flow channel from the first flow channel and having a bar shape; and a first ground body, which connects the first heating body to the positive electrode of the power source and is positioned under the third flow channel, and the second heating part includes: a second heating body which extends toward the second flow channel from the first flow channel and is spaced apart from the first heating body by a predetermined distance, the second heating body having a bar shape; and a second ground body which connects the second heating body to the negative electrode of the power source and is positioned under the third flow channel, and the third heating part is configured to have an inflection portion positioned under the first flow channel and connects the first heating body to the second heating body. a generator body including an introduction part through which fluid is introduced and a discharge part through which the fluid is discharged; a first flow channel defining a flowing path for fluid, which is introduced into the generator body through the introduction part; a second flow channel connected to the first flow channel to guide fluid toward the discharge part; a third flow channel for allowing the second flow channel to communicate with the discharge part; and a heating part for heating the generator body to supply heat to fluid in the respective flow channels (75, 76, 77), the heating part comprising: a first heating part connected to a positive electrode of a power source to supply heat to fluid in the second flow channel; a second heating part connected to a negative electrode of the power source and spaced apart from the first heating part by a predetermined distance to supply heat to fluid in the second flow channel; and a third heating part connecting the first and second heating parts to supply heat from at least partial area thereof to fluid in the first flow channel, a first heating part connected to a positive electrode of a power source to supply heat to fluid in the second flow channel; a second heating part connected to a negative electrode of the power source and spaced apart from the first heating part by a predetermined distance to supply heat to fluid in the second flow channel; and a third heating part connecting the first and second heating parts to supply heat from at least partial area thereof to fluid in the first flow channel, characterized in that the first heating part includes: a first heating body extending toward the second flow channel from the first flow channel and having a bar shape; and a first ground body, which connects the first heating body to the positive electrode of the power source and is positioned under the third flow channel, and the second heating part includes: a second heating body which extends toward the second flow channel from the first flow channel and is spaced apart from the first heating body by a predetermined distance, the second heating body having a bar shape; and a second ground body which connects the second heating body to the negative electrode of the power source and is positioned under the third flow channel, and a first heating body extending toward the second flow channel from the first flow channel and having a bar shape; and a first ground body, which connects the first heating body to the positive electrode of the power source and is positioned under the third flow channel, and the second heating part includes: a second heating body which extends toward the second flow channel from the first flow channel and is spaced apart from the first heating body by a predetermined distance, the second heating body having a bar shape; and a second ground body which connects the second heating body to the negative electrode of the power source and is positioned under the third flow channel, and a second heating body which extends toward the second flow channel from the first flow channel and is spaced apart from the first heating body by a predetermined distance, the second heating body having a bar shape; and a second ground body which connects the second heating body to the negative electrode of the power source and is positioned under the third flow channel, and the third heating part is configured to have an inflection portion positioned under the first flow channel and connects the first heating body to the second heating body.