Patent ID: 7350905

Claim:
An internal pressure-stabilizing apparatus comprising: a main wall member which defines a main space which accommodates a gas in at least a part thereof; and a subsidiary wall member which defines a subsidiary space communicated with the main space, wherein: a plurality of first areas and a plurality of second areas having liquid repellence higher than that of the first areas are formed alternately in an extending direction of the subsidiary space on an inner wall of the subsidiary wall member; and a difference in air pressure between both sides of a liquid, which is required for the liquid to enter a second area of the second areas when the liquid exists on a first area of the first areas disposed adjacently to the second area on a side far from the main space, is different from a difference in air pressure between both sides of a liquid which is required for the liquid to enter the second area when the liquid exists on a first area disposed adjacently to the second area on a side near to the main space.