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 value of ΔWI of not more than 2.5, the ΔWI being defined in Formula (1) below,
• ΔWI=WI1−WI0 Formula (1)
• where
• WI represents a white index defined in American Standard Test Methods E313,
• WI0 represents a WI value of a surface of the porous base material which WI value is measured with use of a spectrocolorimeter before the porous base material is irradiated with ultraviolet light with an intensity of 255 W/m2, and
• WI1 represents a WI value of the surface of the porous base material which WI value is measured with use of the spectrocolorimeter after the porous base material is irradiated with ultraviolet light with an intensity of 255 W/m2 for 75 hours,
• 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.