To provide ceramic-based, fiber-reinforced composite material capable of preventing the degradation of ceramic fiber in reaction sintering and capable of sufficiently manifesting its strength characteristics, and to provide a method for producing the same composite material.

When this ceramic-based, fiber-reinforced composite material 10 contains ceramic fiber as a reinforcing ingredient in ceramic-based matrix 11, the surface of each ceramic fiber is coated with a boundary layer 14 for weakening a binding force between the matrix and the ceramic fiber, and an oxide layer is made to exist between the ceramic fiber and the layer 14.