Provided is copper paste for joining including metal particles, and a dispersion medium. The metal particles include sub-micro copper particles having a volume-average particle size of 0.12 μm to 0.8 μm, and flake-shaped micro copper particles having a maximum particle size of 1 μm to 20 μm, and an aspect ratio of 4 or greater, and the amount of the micro copper particles contained, which are included in the metal particles and have a maximum particle size of 1 μm to 20 μm and an aspect ratio of less than 2, is 50% by mass or less on the basis of a total amount of the flake-shaped micro copper particles.