Laminated body

A laminated body, comprising:

• a porous base material containing a polyolefin-based resin as a main component;
• and
• a porous layer on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin,
• the porous base material having a parameter X of not more than 20, the parameter X being calculated in accordance with a formula below, where MD tan δ represents a tan δ measured in a machine direction through a viscoelasticity measurement performed at a frequency of 10 Hz and a temperature of 90° C., and TD tan δ represents a tan δ measured in a transverse direction through the viscoelasticity measurement,
• X=100×|MD tan δ−TD tan δ|/{(MD tan δ+TD tan δ)/2}
• the polyvinylidene fluoride-based resin containing crystal form α in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form α and crystal form β contained in the polyvinylidene fluoride-based resin,
• where the amount of the crystal form α is calculated from an absorption intensity at around 765 cm−1 in an IR spectrum of the porous layer, and an amount of the crystal form β is calculated from an absorption intensity at around 840 cm−1 in the IR spectrum of the porous layer.