An electromagnetic induction heating apparatus for heating a fluid includes a tubular insulating member (10) through which the fluid flows, and the tubular insulating member (10) is surrounded by an outer shell member (2, 3) exclusively of its exit-side opening (10e) serving as an exit for the fluid. The outer shell member (2, 3) is provided, at a position nearer to the exit-side opening (10e) than to an inlet-side opening (10i) serving as an inlet for the fluid of the tubular insulating member (10), with an inflow port (3a) through which the fluid flows into the outer shell member (2, 3), an electromagnetic induction coil (25) is wound around an outer periphery of the tubular insulating member (10), and a heating magnetic body (20) is disposed inside the tubular insulating member (10) in a state of forming flow paths. The above arrangement provides a small-type electromagnetic induction heating apparatus with which fluid heating efficiency can be enhanced and a high-pressure fluid can also be heated.