A motor-driven compressor with a housing and an electric motor includes a stator that includes a stator core including a yoke and teeth, an insulator including an insulator base in contact with an end face of the yoke, and three-phase windings, each being wound around the corresponding teeth in a concentrated manner so as to form coils. The winding of each phase forms connection wires locked on an outer circumferential surface of the insulator base. Each connection wire connects adjacent coils of the corresponding phase. The outer circumferential surface includes a locking surface including accommodation grooves, each accommodating the corresponding connection wire, and a non-locking surface that does not lock the connection wires. The stator core includes an engagement recess that engages with part of a jig. The engagement recess is located radially outward from the insulator base on the end face and located radially outward from the non-locking surface.