The polycarbodiimide composition is a reaction product of a polyisocyanate having a primary isocyanate group and alcohols, and the alcohols include at least one oxyethylene group-containing alcohol containing an oxyethylene group and at least one oxyethylene group-free alcohol The oxyethylene group-free alcohol has a solubility parameter of at least one type of oxyethylene group-free alcohol of 11.20 (cal/cm 3 ) 1/2 or less.