Electrode group and secondary battery

An electrode group comprising

• a positive electrode and a negative electrode, wherein
• the positive electrode and the negative electrode are stacked with a separator interposed therebetween,
• the positive electrode includes:
• a rectangular positive electrode current collector having a long side and a short side;
• a positive mixture layer in which a positive mixture is applied onto the positive electrode current collector in parallel with the short side of the positive electrode current collector;
• a positive mixture layer non-coated portion in which the positive mixture is not applied;
• and an insulating portion covering an interface between the positive mixture layer and the positive mixture layer non-coated portion, and
• the negative electrode includes:
• a rectangular negative electrode current collector having a long side and a short side;
• and a negative mixture layer in which a negative mixture is applied onto the negative electrode current collector in parallel with the short side of the negative electrode current collector, wherein
• the insulating portion has a first region covering at least a part of the positive mixture layer non-coated portion and a second region covering at least a part of the positive mixture layer, and
• an end portion parallel to a short side of the negative mixture layer is provided at a position facing the second region of the insulating portion.