A drunken driving prevention device having an alcohol sensor and being mounted on a vehicle including an automobile includes a judging element for judging whether inspection for detecting alcohol via the alcohol sensor should be performed or not based on predetermined conditions when the vehicle is started. The drunken driving prevention device further includes an element for performing the inspection via the alcohol sensor when the judging element judges to perform inspection, and a control element for disabling operation of the vehicle if alcohol is detected as a result of the inspection.
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