Abstract: A pipet cleaning apparatus in which cleaning liquid is fed into a cleaning tank, where a pipet is accommodated, through a feeding pipe line, a liquid level in the tank is raised to the full liquid level to immerse the pipet in the cleaning liquid, then the used cleaning liquid is overflown through an overflow portion of a discharging pipe line and by repeating the same process, the pipet cleaning is carried out, characterized in that the cleaning liquid is detected by a sensor at a level lower than the full liquid level by each cleaning time, the detected signal is counted by a counter, and when a preset number of cleaning times is counted, a valve of the feeding pipe line is closed.