Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device

A uniaxially stretched multi-layer laminate film, in which a first layer and a second layer are alternately laminated, comprising an intermediate layer which is inside of the alternately laminated configuration of the first and second layers and which has a thickness of 2 μm or more and 30 μm or less, wherein

• (1) the first layer is composed of a polyester containing a naphthalene dicarboxylic acid ester,
• (2) the second layer is composed of a copolymer polyester and is an optically isotropic layer having an average refractive index of 1.50 or more and 1.60 or less,
• (3) the first layer, the second layer, both first and second layers, or the intermediate layer contains a visible light absorbent that exhibits a weight loss of less than 10% when the visible light absorbent is kept at 300° C. for 1 hour, in an amount of 200 ppm or more and 2500 ppm or less on the basis of the weight of each layer, and
• (4) the uniaxially stretched multi-layer laminate film has a polarization degree (P %) represented by the following equation (1) of 99.5 or more and an average transmission Ts of 60% or more for S-polarized light in a wavelength range of 400 nm to 800 nm,
• Polarization degree(P)={(Ts−Tp)/(Tp+Ts)}×100 (1)
• wherein Tp represents an average transmission for P-polarized light in a wavelength range of 400 nm to 800 nm and Ts represents an average transmission for S-polarized light in a wavelength range of 400 nm to 800 nm.