An ultrasound imaging apparatus, comprising a transmitter for transmitting a fundamental wave pulse to a subject, the fundamental wave pulse consisting of a first ultrasound wave and a second ultrasound wave having an inverted waveform of the first ultrasound wave a receiver for receiving echo signals (31, 34) in response to the first and second ultrasound waves of the fundamental wave pulse from the subject, and a signal processor for processing the echo signals received by the receiver and for generating image data, wherein the receiver has a predetermined reception band with lower limit frequency f 1 and upper limit frequency f 2, characterized in that each of the first and second ultrasound waves of the fundamental wave pulse transmitted by the transmitter has a single frequency peak at frequency f c and a frequency band determined by a lower limit frequency f c -f s and an upper limit frequency f c +f s, wherein the lower limit frequency f c -f s of the frequency band of the fundamental wave pulse is set higher than the lower limit frequency f 1 of the reception band and the upper limit frequency f c +f s of the frequency band of the fundamental wave pulse is set equal to or higher than triple the lower limit frequency f 1 of the reception band, and wherein the lower limit frequency f 1 of the reception band is smaller than or equal to f s and the frequency f c is larger than or equal to two times f s, and wherein the signal processor is adapted to add the echo signals received by the receiver in response to the first and second ultrasound waves from the subject, and to generate image data from the added signal by using harmonic components of the added signal, among them at least the low-frequency harmonic components at frequencies f s and 2f c -2f s. a transmitter for transmitting a fundamental wave pulse to a subject, the fundamental wave pulse consisting of a first ultrasound wave and a second ultrasound wave having an inverted waveform of the first ultrasound wave a receiver for receiving echo signals (31, 34) in response to the first and second ultrasound waves of the fundamental wave pulse from the subject, and a signal processor for processing the echo signals received by the receiver and for generating image data, wherein the receiver has a predetermined reception band with lower limit frequency f 1 and upper limit frequency f 2, characterized in that each of the first and second ultrasound waves of the fundamental wave pulse transmitted by the transmitter has a single frequency peak at frequency f c and a frequency band determined by a lower limit frequency f c -f s and an upper limit frequency f c +f s, wherein the lower limit frequency f c -f s of the frequency band of the fundamental wave pulse is set higher than the lower limit frequency f 1 of the reception band and the upper limit frequency f c +f s of the frequency band of the fundamental wave pulse is set equal to or higher than triple the lower limit frequency f 1 of the reception band, and wherein the lower limit frequency f 1 of the reception band is smaller than or equal to f s and the frequency f c is larger than or equal to two times f s, and wherein the signal processor is adapted to add the echo signals received by the receiver in response to the first and second ultrasound waves from the subject, and to generate image data from the added signal by using harmonic components of the added signal, among them at least the low-frequency harmonic components at frequencies f s and 2f c -2f s.