A target search system includes: a signal processing unit that is input with a received signal including a reflected wave based on a pulsed transmission wave modulated in linear frequency modulation, calculates mutual correlation between the transmission wave and the received signal, and amplifies a power ratio of a signal component of a reflected wave from a target and another signal component at a predetermined process gain; a specifying unit by which a user specifies one value of a pulse length, a frequency change ratio, and a frequency amplitude of the transmission wave and the process gain; and a transmission wave determination unit that determines a remaining value of the transmission wave based on the specified one value of the pulse length, the frequency change ratio, and the frequency amplitude of the transmission wave and the specified process gain so as to satisfy a relational equation for the process gain.