Provided is a speech recognition device that executes a speech recognition method capable of improving speech recognition accuracy. The speech recognition device includes a trigger generation unit for generating a trigger signal on the basis of at least mouth movement and a speech recognition unit which extracts a sound signal on the basis of the trigger signal and starts speech recognition for speech in the extracted sound signal. When the trigger generation unit is generating a trigger signal solely on the basis of opening of the mouth, the trigger generation unit generates the trigger signal so as to precede the opening of the mouth by a predetermined period. Alternatively, when the trigger generation unit is generating a trigger signal on the basis of opening of the mouth and changes in eye orientation, the trigger generation unit generates the trigger signal from the moment any of the above occurs.