The Japanese In-Car Speech Recognition Database is collected in Japan. It contains the voices of 309 different native speakers (134males, 175 females) who were balanced distributed in age (mainly 16 – 30,31 – 45,46 – 65), gender and regional accents (for the details, please see the technical document). The script contains 98,981(approx.) utterances in total, 333.3 utterances for each speakers, covering 18 categories and 55 sub-categories (for more details of script structure design,please check the specification), specially designed to provide material for both training and testing of many classes of speech recognizers. Each speaker was recorded in 2 environments out of 7 optional environments (STOP_MOTOR_RUNNING, LOW_SPEED_ROUGH_ROAD, HIGH_SPEED_GOOD_ROAD, etc) with various recording conditions (motor running, fan on/off, window up/down and etc). 4 high quality audio channels Shure SM10A / Sennheiser ME104 /AKG C400BL/AKG C400BL were used in a car, at least 3 popular car models were adopted. The recording software (AUDIOREC) is developed by Speechocean. Each utterance wave was stored in a separate file as uncompressed PCM raw data. Each file is accompanied by an ASCII SAM label file which contains the relevant descriptive information. All audio files were manually transcribed and annotated by native transcribers. Details are available with Specification. The corpus follows the general convention of SpeechDat-Car.