To provide an ultrasonic wave transmitting and receiving method, etc., capable of achieving high secureness in generating a sub-harmonic echo, and displaying sub-harmonic information at a speed close to real time.

This method is provided with a step of transmitting ultrasonic waves continuous for four cycles or more to a subject, a step of detecting an echo generated by reflection of the transmitted ultrasonic waves on a tissue in the subject to obtain a reception signal R1, a step of delaying the reception signal R1 for a time equivalent to one cycle of the transmitted ultrasonic waves to obtain a delayed reception signal R2, and a step of extracting a sub-harmonic component RSUB of the echo based on difference between the reception signal and the delayed reception signal.