Patent ID: 8217089

Claim:
An elastomer porous material, wherein: when cells in a first observation region of a first cross section are observed at a certain magnification, cells having a shape factor SF1 of 150 or less account for 80% or more of all cells in the first observation region, wherein SF1 indicates roundness of a circle and is represented by formula F1: SF ⁢ ⁢ 1 = π ⁢ ⁢ a 2 4 ⁢ A × 100 , wherein a represents a length of a major axis of each cell, and A represents an area thereof, and when cells in a second observation region of a second cross section orthogonal to the first cross section are observed at said certain magnification, cells having the shape factor SF1 of 150 or less account for 80% or more of all cells in the second observation region.