To provide an immunity testing device capable of suppressing cost required for an immunity test, and improving workability of the immunity test.

In this immunity testing device, a horn antenna for radiating a test radio wave toward a test apparatus is equipped with a pyramid horn 22 for 1GHz; and a coaxial waveguide converter 24 mounted directly on the pyramid horn 22, capable of feeding a signal in the 1GHz band. The coaxial waveguide converter 24 can be dismounted from the pyramid horn 22, and a coaxial waveguide converter 26 capable of feeding a signal in the 3GHz band can be mounted on the pyramid horn 22 through an adapter 30. Hereby, preparation of an exclusive horn antenna is not required for each test, and the pyramid horn 22 can be used in common for each test.

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