Negative pressure controller

A negative pressure controller configured to control a negative pressure in a vacuum chamber of a vacuum booster by controlling a negative pressure supplier connected to the vacuum chamber, the negative pressure controller, comprising:

• a plurality of negative pressure sensors each configured to detect the negative pressure in the vacuum chamber;
• and
• a negative-pressure-supplier controller configured to actuate the negative pressure supplier when one of output values of the plurality of negative pressure sensors which is nearest to an atmospheric pressure among the output values becomes nearer to an atmospheric pressure than a first threshold value, the negative-pressure-supplier controller being configured to stop the negative pressure supplier when at least two output values of the output values of the plurality of negative pressure sensors become nearer to a vacuum than a second threshold value.