Separator for lead storage battery

Provided is a separator for a lead storage battery in which no hole is formed in a separator comprising a microporous film. The present invention is provided with: a base part (3) which is a microporous membrane having a thickness of 0.1-0.3 mm; a plurality of main ribs (2a) provided on one surface (3a) of the base part (3); and a plurality of micro ribs (2b) provided on the other surface (3b) of the base part (3) and having a height lower than the height of the main ribs (2a). The plurality of micro-ribs (2b) are linearly provided so that the inter-rib distance (P), which is the distance between the facing surfaces of adjacent micro-ribs (2b), is less than 1.9 mm. 提供不会在由微多孔质膜构成的隔板中穿出孔的铅蓄电池用隔板。具备：基体部(3)，是厚度为0.1～0.3mm的微多孔质膜；多个主肋(2a)，设置于基体部(3)的一方的面(3a)；以及多个微型肋(2b)，设置于基体部(3)的另一方的面(3b)，高度比主肋(2a)的高度低。多个微型肋(2b)以使相邻的微型肋(2b)的相向的面的距离即肋间距离(P)小于1.9mm的方式线状地设置。