An inspecting apparatus for reducing a time loss associated with a work for changing a detector is characterized by comprising a plurality of detectors 11, 12for receiving an electron beam emitted from a sample W to capture image data representative of the sample W, and a switching mechanism M for causing the electron beam to be incident on one of the plurality of detectors 11, 12, where the plurality of detectors 11, 12 are disposed in the same chamber MC. The plurality of detectors 11, 12 can be an arbitrary combination of a detector comprising an electron sensor for converting an electron beam into an electric signal with a detector comprising an optical sensor for converting an electron beam into light and converting the light into an electric signal. The switching mechanism M may be a mechanical moving mechanism or an electron beam deflector.