Electrode plate for rectangular nonaqueous electrolyte storage cell

Provided is an electrode plate for a rectangular nonaqueous electrolyte storage cell that is easily processed and is capable of preventing shorting inside a container. A first curved section (21) and a second curved section (23) are formed in at least a first corner section (11) and a second corner section (13) of an electrode plate (1) for a rectangular nonaqueous electrolyte storage cell provided with a first side (3), a second side (5), a third side (7) and a fourth side (9). The first curved section (21) is formed so as to form an acute angle (θ 11 ) between the first side (3) and a first extension (3') of a tangent (22A) of the first curved section (21) at the tangent point (21A) of the first curved section (21). The first curved section (21) is also formed so as to form an acute angle (θ 12 ) between the second side (5) and a second extension (5') of a tangent (22B) of the first curved section (21) at the tangent point (21B) of the first curved section. The second curved section (23) is formed in the same manner.