A noise suppresser is provided which does not generate steady noise generated by a drop in the receiving field strength, pulse-type unsteady noise generated in a multipass environment and the like as well as musical noise due to excessive subtraction and the like.The noise suppresser (100) includes a field strength analysis unit (3) which analyzes change in a field strength d of a digital signal x, and a frame generation unit (1) which generates a frame made up of signal values accumulated within a range which does not exceed a predetermined threshold value when the analyzed field strength has changed and exceeds the predetermined threshold value. Further, the noise suppresser (100) includes a noise estimation unit (4) which estimates a noise pattern |N|n′ mixed in the input signal x when the field strength has changed and exceeds the predetermined threshold value, and a noise suppression unit (5) which suppresses the noise included in the generated frame using the estimated noise pattern.