Provided is a mobile phone case having a hidden camera detection function. The mobile phone case includes a case body whose one surface is formed to enclose portions, except for a display of a mobile phone and having an opening formed at a position corresponding to a light emitting diode (LED) light source and a camera of the mobile phone; a detector including a red filter for passing through light of a red wavelength of a wavelength range of 600 nm to 700 nm; and an operation unit whose one end is coupled to the detector and whose the other end is protruded to the other surface of the case body and for enabling the detector to move in a vertical or horizontal direction, wherein the detector covers or opens the opening by the operating unit.