The invention can produce an infected nail of an animal and an infected animal model in which the nail plate and nail bed of the nail are sufficiently infected with a superficial fungus which were difficult to be produced in the past, and provides an evaluation method useful for development of a therapeutic agent for intractable infectious diseases such as tinea unguium using the nail and the infected animal model. For producing the infected nail of an animal and the infected animal model infected with a superficial fungus, an immunosuppressive component is administered to an animal in advance to decrease immunocompetence, and then, a superficial fungus is inoculated into the animal, whereby the infected nail of an animal and the infected animal model reflecting clinical manifestation in which the nail plate and nail bed of the nail are sufficiently infected with the superficial fungus can be produced with good reproducibility in a short period of time.
