Stator and electric motor

A stator comprising:

• a stator core that is formed by stacking a plurality of steel sheets each having a through hole penetrating the steel sheet in its thickness direction;
• a pair of housings that are arranged at positions sandwiching the stator core in a stacking direction, each housing including a screw hole arranged at a position aligning with the through hole;
• and
• a tightening rod that penetrates the through hole of the stator core and that includes male threads that are respectively screwed into the screw holes of the housings,
• wherein the male thread on one end of the tightening rod is a right-hand thread, and the male thread on another end is a left-hand thread, and
• wherein an engaging portion that is engaged with a tool for turning the tightening rod around a longitudinal axis of the tightening rod is provided in at least one end surface of the tightening rod.