A sound image localization apparatus for executing a sound image localizing processing based on a head-related transfer function corresponding to a target position of a sound image to be localized, comprising: a first frequency component analyzing unit operable to convert said head-related transfer function into frequency components; a second frequency component analyzing unit operable to convert a sound source signal into frequency components; a frequency component comparing/correcting unit operable to compare frequency components of said sound source signal with frequency components of said head-related transfer function so as to determine whether or not a clipping is to occur in a particular frequency range, and to correct said frequency components of said head-related transfer function when said clipping is determined to occur; and a sound image localization processing unit operable to execute data processing by using said sound source signal and said head-related transfer function corrected by said frequency component comparing/correcting unit, and to output a sound image localizing signal, wherein said frequency component comparing/correcting unit corrects to attenuate an amplitude of said frequency components of the head-related transfer function under the condition that -|H (f)| < |S (f)| is satisfied in a frequency range to ensure that the condition -IH (f)I > |S (f)| I is fulfilled over the entire frequency range, where - |H (f)| is expressed in dB and is the opposite sign of the absolute value of the amplitude component of the frequency component of the head-related transfer function, and |S (f)| is expressed in dB and is the absolute value of the frequency component of the sound source signal, and said frequency component comparing/correcting unit outputs the corrected head-related transfer function to the sound image localization processing unit. a first frequency component analyzing unit operable to convert said head-related transfer function into frequency components; a second frequency component analyzing unit operable to convert a sound source signal into frequency components; a frequency component comparing/correcting unit operable to compare frequency components of said sound source signal with frequency components of said head-related transfer function so as to determine whether or not a clipping is to occur in a particular frequency range, and to correct said frequency components of said head-related transfer function when said clipping is determined to occur; and a sound image localization processing unit operable to execute data processing by using said sound source signal and said head-related transfer function corrected by said frequency component comparing/correcting unit, and to output a sound image localizing signal, wherein said frequency component comparing/correcting unit corrects to attenuate an amplitude of said frequency components of the head-related transfer function under the condition that -|H (f)| < |S (f)| is satisfied in a frequency range to ensure that the condition -IH (f)I > |S (f)| I is fulfilled over the entire frequency range, where - |H (f)| is expressed in dB and is the opposite sign of the absolute value of the amplitude component of the frequency component of the head-related transfer function, and |S (f)| is expressed in dB and is the absolute value of the frequency component of the sound source signal, and said frequency component comparing/correcting unit outputs the corrected head-related transfer function to the sound image localization processing unit.