Copper particles and method for manufacturing same

Copper particles mainly comprising a copper element,

• wherein a ratio (S1/B) of a first crystallite size S1 to a particle size B is 0.23 or less, the first crystallite size being obtained using Scherrer equation from a full width at half maximum of a peak derived from (111) plane of copper in X-ray diffraction measurement, and the particle size being calculated from a Brunauer-Emmett-Teller specific surface area,
• a ratio (S1/S2) of the first crystallite size S1 to a second crystallite size S2 is 1.35 or less, the second crystallite size being obtained using Scherrer equation from a full width at half maximum of a peak derived from (220) plane of copper in X-ray diffraction measurement,
• the copper particles are flat-shaped, and
• the (111) plane of copper exists on a main face of the flat-shaped copper particles, and the (220) plane of copper exists on a side face of the flat-shaped copper particles.