Curable composition for polymer electrolyte, and layered body

A curable composition for a polymer electrolyte, comprising:

• a component (A):
• a radical polymerizable compound having a (meth)acryloyl group,
• a component (B):
• a compound having, in one molecule, an epoxy group and a skeleton of at least one selected from the group consisting of polybutadiene, polyisoprene, hydrogenated polybutadiene, and hydrogenated polyisoprene, and
• a component (C):
• a radical polymerization initiator,
• wherein a content of each of the components (A) to (C) based on the entire composition is as follows,
• the component (A):
• from 30 to 98.9% by mass
• the component (B):
• from 1 to 40% by mass, and
• the component (C):
• from 0.1 to 15% by mass,
• wherein the component (A) comprises a component (a1):
• a compound having, in one molecule, a (meth)acryloyl group and a skeleton of at least one selected from the group consisting of polybutadiene, polyisoprene, hydrogenated polybutadiene, and hydrogenated polyisoprene,
• wherein a content of the component (a1) based on the entire component (A) is from 20 to 100% by mass, and
• wherein the component (a1) comprises the compound having a urethane bond in the molecule.