The present invention provides a binder which has a peel strength that is high enough to suppress particle fall-off during cutting of an electrode, and which is suitable for the achievement of an electrode having a low resistance. The present invention discloses a binder for electricity storage device electrodes, said binder containing a polyvinyl alcohol resin and an electrolyte solution-swellable resin that has an electrolyte solution swelling ratio of 10% by mass or more, said electrolyte solution swelling ratio being represented by formula (1).(1): (Electrolyte solution swelling ratio) = ((W2 - W1)/W1 × 100)(In formula (1), W1 represents the mass (g) of the resin before immersion in the electrolyte solution; and W2 represents the mass (g) of the resin after being immersed in diethyl carbonate at 25°C for 24 hours.)With respect to this binder for electricity storage device electrodes, the polyvinyl alcohol resin has a viscosity of 4 Pa·s or more as measured in the form of an aqueous solution having a solid content concentration of 10% by mass at 25°C at a shear rate of 10 s-1.
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