Abstract: A speech synthesis device, in which the sound quality is not significantly degraded when generating a synthesized sound, includes a target element information generation unit (102), an element database (103), an element selection unit (104), a voice characteristics designation unit (105), a voice characteristics transformation unit (106), a distortion determination unit (108), and a target element information correction unit (109). When the speech element sequence transformed by the voice characteristics transformation unit (106) is determined as distorted by the distortion determination unit (108), the target element information correction unit (109) corrects the speech element information generated by the target element information generation unit (102) to the speech element information of the transformed voice characteristic, and the element selection unit (104) reselects a speech element sequence.