A fake finger determination apparatus, comprising: a mounting surface having a first and a second mounting area to mount an authentication target that is an object of fingerprint authentication in different positions, wherein two transparent plates defining an image capturing area are provided on the mounting surface and define a range of an image to be captured; an imaging unit being adapted to capture two images of the authentication target mounted on the two mounting areas at a set imaging time interval, wherein the authentication target is mounted on each of the two mounting areas by way of the two transparent plates, wherein each of the two captured images comprises two transmitted light images captured through the two transparent plates; one or a plurality of light sources that allow light to directly enter the authentication target when mounted on the first or second mounting area; a combining unit being adapted to combine the two images captured by the imaging unit at the set imaging time interval into one image; and a determining unit being adapted to determine the authenticity of the authentication target depending on whether a brightness value of one or a plurality of predetermined pixels included in the image combined by the combining unit is within a range of brightness values which a human finger imaged as the authentication target could exhibit according to the distance between the one or a plurality of light sources and the image, wherein the one or a plurality of light sources is adapted to irradiate the light onto the authentication target from a bottom of the authentication target; a light emitting surface for emitting the light of the one or a plurality of light sources is disposed on the same plane as the mounting surface; the light emitting surface is disposed between the two transparent plates; the positional shift between the two mounting areas is set so as to match with the distance between the two transparent plates; and the combining unit is adapted to compare a pattern of the two transmitted light images of the authentication target mounted on the first mounting area and a pattern of the two transmitted light images of the authentication target mounted on the second mounting area and to superpose similar characteristic points with each other so as to combine the two transmitted light images of the authentication target mounted on the first mounting area and the two transmitted light images of the authentication target mounted on the second mounting area. a mounting surface having a first and a second mounting area to mount an authentication target that is an object of fingerprint authentication in different positions, wherein two transparent plates defining an image capturing area are provided on the mounting surface and define a range of an image to be captured; an imaging unit being adapted to capture two images of the authentication target mounted on the two mounting areas at a set imaging time interval, wherein the authentication target is mounted on each of the two mounting areas by way of the two transparent plates, wherein each of the two captured images comprises two transmitted light images captured through the two transparent plates; one or a plurality of light sources that allow light to directly enter the authentication target when mounted on the first or second mounting area; a combining unit being adapted to combine the two images captured by the imaging unit at the set imaging time interval into one image; and a determining unit being adapted to determine the authenticity of the authentication target depending on whether a brightness value of one or a plurality of predetermined pixels included in the image combined by the combining unit is within a range of brightness values which a human finger imaged as the authentication target could exhibit according to the distance between the one or a plurality of light sources and the image, wherein the one or a plurality of light sources is adapted to irradiate the light onto the authentication target from a bottom of the authentication target; a light emitting surface for emitting the light of the one or a plurality of light sources is disposed on the same plane as the mounting surface; the light emitting surface is disposed between the two transparent plates; the positional shift between the two mounting areas is set so as to match with the distance between the two transparent plates; and the combining unit is adapted to compare a pattern of the two transmitted light images of the authentication target mounted on the first mounting area and a pattern of the two transmitted light images of the authentication target mounted on the second mounting area and to superpose similar characteristic points with each other so as to combine the two transmitted light images of the authentication target mounted on the first mounting area and the two transmitted light images of the authentication target mounted on the second mounting area.