To accurately inform a user of the voice pick-up state of a microphone.

A speech input device 100 is provided with: a microphone 10 for picking up voices that are generated when a user speaks; a speech-segment determination unit 31 for detecting a speech input period corresponding to a period during which the user's voice is inputted, on the basis of processing of a speech waveform supplied from the microphone 10, and for outputting a determination signal Sig_RD that indicates whether a period is the speech input period; and an informing unit (an LED driver 33 and an LED 50) for informing the user of a detected state of the speech input period by the speech-segment determination unit 31 on the basis of the output from the speech-segment determination unit 31.