Core piece, stator core, stator, rotary electric machine, and method for producing core piece

A constituent member of a rotary electric machine of an axial gap type, the constituent member being disposed in a circular arrangement to be used, wherein

• the constituent member is configured by a green compact,
• a shape of the constituent member as seen from above in an axial direction of the circular arrangement is a trapezoidal shape having an inner peripheral surface located on an inner peripheral side of the circular arrangement, an outer peripheral surface located on an outer peripheral side of the circular arrangement, a first lateral surface and a second lateral surface that connect the inner peripheral surface and the outer peripheral surface to each other,
• a length of the outer peripheral surface between the first lateral surface and the second lateral surface is longer than a length of the inner peripheral surface between the first lateral surface and the second lateral surface,
• the green compact includes a plurality of soft magnetic particles,
• the soft magnetic particles have a flat shape,
• a first average aspect ratio of the soft magnetic particles is greater than or equal to 1.2 in a first cross section of the constituent member in the axial direction of the circular arrangement and a radial direction perpendicular to the axial direction,
• the first average aspect ratio is a ratio L12/L11 between an average length L11 and an average length L12 in the first cross section,
• the average length L11 is an average of lengths of the soft magnetic particles in the radial direction, and
• the average length L12 is an average of lengths of the soft magnetic particles in the axial direction.