An inductive heating device comprising: a coil unit (1A to 1D) including a heating coil for heating a to-be-heated object, a plurality of ferrites placed under the heating coil in a vertical direction, and a coil base (5A to 5C); and a heat dissipation plate for directly placing the coil unit (1A to 1D) thereon, wherein the coil unit (1A to 1D) is placed on a flat surface of the heat dissipation plate (12A to 12E) such that a placement surface of the coil unit (1A to 1D) and the flat surface are in a surface contact with each other, there is placed a member having an electrical insulation function and a heat conduction function, between the heating coil and the ferrites, characterized in that: the coil base (5A to 5C) comprises plural housing holes which house the plural ferrites respectively; the coil unit (1A to 1D) has the placement surface formed from a lower surface of the coil base (5A to 5C) in the vertical direction and lower surfaces of the plural ferrites housed in the housing holes in the coil base (5A to 5C) in the vertical direction which are flushed with each other; there is provided a heat conductive member being an adhesive agent having a heat conduction function between the heating coil and the ferrites, with an electrical insulating member being a mica plate having an electrical insulating function interposed therebetween, and the heat conductive member is embedded in areas which oppose each other in a vertical direction, namely an area between the heating coil and the electrical insulating member and an area between the electrical insulating member and the ferrites; and the mica plate comprises plural coupling holes at portions of its area faced to both the heating coil and the coil base (5A to 5C), said coupling holes being filled with the adhesive agent. a coil unit (1A to 1D) including a heating coil for heating a to-be-heated object, a plurality of ferrites placed under the heating coil in a vertical direction, and a coil base (5A to 5C); and a heat dissipation plate for directly placing the coil unit (1A to 1D) thereon, wherein the coil unit (1A to 1D) is placed on a flat surface of the heat dissipation plate (12A to 12E) such that a placement surface of the coil unit (1A to 1D) and the flat surface are in a surface contact with each other, there is placed a member having an electrical insulation function and a heat conduction function, between the heating coil and the ferrites, characterized in that: the coil base (5A to 5C) comprises plural housing holes which house the plural ferrites respectively; the coil unit (1A to 1D) has the placement surface formed from a lower surface of the coil base (5A to 5C) in the vertical direction and lower surfaces of the plural ferrites housed in the housing holes in the coil base (5A to 5C) in the vertical direction which are flushed with each other; there is provided a heat conductive member being an adhesive agent having a heat conduction function between the heating coil and the ferrites, with an electrical insulating member being a mica plate having an electrical insulating function interposed therebetween, and the heat conductive member is embedded in areas which oppose each other in a vertical direction, namely an area between the heating coil and the electrical insulating member and an area between the electrical insulating member and the ferrites; and the mica plate comprises plural coupling holes at portions of its area faced to both the heating coil and the coil base (5A to 5C), said coupling holes being filled with the adhesive agent. the coil base (5A to 5C) comprises plural housing holes which house the plural ferrites respectively; the coil unit (1A to 1D) has the placement surface formed from a lower surface of the coil base (5A to 5C) in the vertical direction and lower surfaces of the plural ferrites housed in the housing holes in the coil base (5A to 5C) in the vertical direction which are flushed with each other; there is provided a heat conductive member being an adhesive agent having a heat conduction function between the heating coil and the ferrites, with an electrical insulating member being a mica plate having an electrical insulating function interposed therebetween, and the heat conductive member is embedded in areas which oppose each other in a vertical direction, namely an area between the heating coil and the electrical insulating member and an area between the electrical insulating member and the ferrites; and the mica plate comprises plural coupling holes at portions of its area faced to both the heating coil and the coil base (5A to 5C), said coupling holes being filled with the adhesive agent.