PURPOSE: To provide a voice synthesizing device which can reduce labor of segmenting the pitch waveform in voice synthesization and can suppress noise generation at the termination of the segmented pitch waveform.

CONSTITUTION: Each zero-cross point immediately before the voice waveform goes beyond the envelope which is prepared by a pitch waveform envelope preparing device 13, and the next zero-cross point is sensed within a certain time before and after the pitch period presumed by a pitch period presuming device 12, and the voice waveform is cut out by a pitch segmenting device 15 while this zero-cross interval is made one pitch of voice waveform. In accordance with any pitch period, a necessary window is set by a waveform forming device 16, and pitch waveforms formed are connected with each other by a waveform connecting device 17, and a resultant synthetic sound is emitted from an output part 18.