There are provided body component measuring apparatus and method using a scanning spectroscopic system. The body component measuring apparatus includes: a light source emitting light a diffraction grating being movable to disperse the light emitted from the light source into light components having a plurality of wavelength bands a shutter controlling transmission of the light components having the plurality of wavelength bands a lens focusing the light components passing through the shutter on the specific portion according to opening or closing of the shutter and a detector detecting the light components passing through the specific portion. Therefore, by applying different amplifier gains to two specific wavelength bands, it is possible to enhance accuracy of measuring a body component concentration.
