Electrode structure, secondary battery, battery pack, vehicle, and stationary power supply

An electrode structure comprising:

• an electrode group;
• and
• a hold member configured to clamp the electrode group in a thickness direction of the electrode group,
• the electrode group satisfying a formula (1) below,
• m/L≤0.01 (1)
• wherein
• the m is a difference Δt in a cross section which is selected from among a plurality of cross sections along the thickness direction of the electrode group such that the difference Δt becomes greatest, the difference Δt being a difference between a thickness t1 of a part T1 in which a thickness of the electrode group in the thickness direction is minimum and a thickness t2 of a part T2 in which the thickness of the electrode group in the thickness direction is maximum, and
• the L is a maximum length of the electrode group in an in-plane direction that is orthogonal to the thickness direction.