Motor core, motor using same, and compressor

This motor core is a stator core (20) which is provided with a plurality of steel sheets (10), and a resin (21). Each of the plurality of steel sheets (10) has, formed therein, a crimp (14), and a first resin insertion hole (15). The size of each of the crimps (14) is at least 1.0 mm, but not more than 5.0 mm. Each of the plurality of steel sheets (10) has a thickness (T) of at least 0.2 mm, but not more than 0.5 mm. The resin (21) is positioned in at least the gaps between adjacent steel sheets (10).