A stator core for an electric motor , the stator core comprising a core body having a back yoke in a cylindrical shape, and a plurality of teeth extending from the back yoke radially inward of the stator core ; a slot located between adjacent ones of the teeth ; and an insulating member integrated with the core body , the insulating member having a linear expansion coefficient different from a linear expansion coefficient of the core body , wherein a peripheral wall portion forms a peripheral wall of the core body and has an inner peripheral wall portion forming a peripheral wall of the slot , and an outer peripheral wall portion forming an outer peripheral wall of the core body , the insulating member is located at at least the inner peripheral wall portion , in each slot the insulating member is divided by a clearance into two separate parts having contact portions in a circumferential direction of the slot , each contact portion extending throughout a cylinder axial direction of the stator core and being in contact with the inner peripheral wall portion , and each clearance extending throughout the cylinder axial direction such as to reduce the thermal stress generated in the insulating member caused by the difference in the linear expansion coefficient between the insulating member and the core body , and the inner peripheral wall portion includes a recess recessed toward an outside of the slot and extending throughout the cylinder axial direction of the stator core , in an area including a first portion radially outside of the clearance and a second portion circumferentially around the first portion a core body having a back yoke in a cylindrical shape, and a plurality of teeth extending from the back yoke radially inward of the stator core ; a slot located between adjacent ones of the teeth ; and an insulating member integrated with the core body , the insulating member having a linear expansion coefficient different from a linear expansion coefficient of the core body , wherein a peripheral wall portion forms a peripheral wall of the core body and has an inner peripheral wall portion forming a peripheral wall of the slot , and an outer peripheral wall portion forming an outer peripheral wall of the core body , the insulating member is located at at least the inner peripheral wall portion , in each slot the insulating member is divided by a clearance into two separate parts having contact portions in a circumferential direction of the slot , each contact portion extending throughout a cylinder axial direction of the stator core and being in contact with the inner peripheral wall portion , and each clearance extending throughout the cylinder axial direction such as to reduce the thermal stress generated in the insulating member caused by the difference in the linear expansion coefficient between the insulating member and the core body , and the inner peripheral wall portion includes a recess recessed toward an outside of the slot and extending throughout the cylinder axial direction of the stator core , in an area including a first portion radially outside of the clearance and a second portion circumferentially around the first portion <EOS>